This post may contain affiliate links. Please read our disclosure policy.

This Crockpot Green Bean Casserole is everything that a green bean casserole can and should be (creamy, appropriately al dente, with a from-scratch flavor and addictively crunchy top) and exactly nothing that it shouldn’t be (mushy, overcooked to the point of destruction, bland).

A baking dish of easy crockpot green bean casserole

Why You’ll Love This Easy Crockpot Green Bean Casserole Recipe

  • The Homemade Filling is Truly Delish! You have two options for green bean casserole: canned cream of mushroom soup mixture (like the Campbell’s crockpot green bean casserole recipe), or an easy homemade mushroom filling. Making the creamy sauce for green bean casserole from scratch is 100% worth it! This mushroom filling is easy, luscious, and anything but bland.
  • It Doesn’t Use any Oven Space. Outsourcing side dishes to the slow cooker is a pro-holiday move. No matter the size of the gathering, we always run out of oven space and the slow cooker is a brilliant solution! This green bean casserole (and Crockpot Scalloped Potatoes, Crock Pot Stuffing, or Crockpot Wild Rice Stuffing) is the perfect way to keep that oven free for Thanksgiving Turkey.
  • It Uses Fresh Green Beans. Like my Healthy Green Bean Casserole, this version uses fresh green beans. Their texture and flavor are superior, and aside from trimming them, they don’t create any extra prep work (no blanching required). Fresh green beans hold up better in the slow cooker than frozen or canned, so you’re not left with a gummy, goopy casserole.
An easy green bean crockpot recipe

How to Make The Best Crockpot Green Bean Casserole

The Ingredients

  • Fresh Green Beans. Fresh green beans are far less likely to overcook even after hours in the crockpot and have a crisp, delicious flavor. Trimming fresh green beans is quite possibly my least favorite kitchen task, and I am telling you, it is worth doing for a fresh green bean casserole.
  • Mushrooms + Onions. No cream of mushroom soup here! Real, fresh mushrooms and onions are sauteed in butter until tender and flavorful. Mushrooms and onions also boost the casserole’s nutrition with their antioxidants and vitamins.
  • Milk. To keep this a healthy green bean casserole crockpot recipe, I skipped the cream/half-and-half and used regular milk. The filling still tasted rich and just the right amount of decadent.
  • Flour. Helps thicken the casserole filling so it’s creamy and luscious.
  • Sherry Vinegar + Nutmeg. A splash of sherry vinegar and a touch of nutmeg make this filling shine. I had a hard time stopping myself from eating it right out of the pan!
  • Cheddar Cheese. I took a note from some classic Midwest versions of this recipe and made this a crockpot green bean casserole with cheese. DELISH.

Substitution Tip!

We made this easy crockpot green bean casserole with cheddar cheese. The flavor was elevated, but still all-American. For a gourmet twist, gruyere would be another incredible option.

  • Crispy Onions. While you can make your own crispy onions at home, I used French’s fried onions. The crispy onions add delightful texture and are scrumptious paired with the creamy mushroom sauce and green beans.

Substitutions for Friend Onions

Now, if the French’s fried onions are not your thing, there are other choices.

  • Panko Breadcrumbs. Melt 2 tablespoons of butter in a medium skillet. Add 2/3 cup panko bread crumbs and stir to coat. Cook and stir for 3 minutes or until lightly browned. Sprinkle on just before serving (you also can make the breadcrumbs up to 1 day in advance; store at room temperature).
  • Fresh Breadcrumbs. Follow the steps above but swap fresh breadcrumbs for the Panko. To make fresh breadcrumbs, tear 4 slices of sandwich bread (or better yet, leftover artisan bread, such as sourdough or a baguette) into pieces and pulse in the food processor until it resembles coarse crumbs.
  • Homemade Fried Onions. Soak 4 cups of thinly sliced yellow onions in 2 1/2 cups buttermilk for about 10 minutes. Mix all-purpose flour, salt, and pepper together in a shallow dish or pie plate. Heat vegetable oil in a large pot on the stovetop until it reaches 375 degrees F. Working in small amounts, dredge the onions in the flour mixture, then drop them into the oil. Once golden, remove the onions from the oil, and let them dry on a paper towel-lined plate.
  • Fried Shallots. Follow the steps above, swapping a thinly sliced shallot for the yellow onion.
  • Bacon. A sure crowd-pleaser! Make this Baked Bacon in the Oven, then crumble the pieces over the casserole at the end. You also can do a crockpot green bean casserole with bacon in combination with any of the above-suggested toppings. If using the Panko or breadcrumb option, consider frying the bacon instead, then sautéing the breadcrumbs in the drippings (YUM).
Chopped mushrooms on a plate

The Directions

Green beans for crockpot fresh green bean casserole
  1. Trim and Cut the Green Beans. Add them to a slow cooker (a 6-quart is best to ensure even cooking).
Mushrooms and onions in a skillet
  1. Sauté. Cook the onion and mushrooms in butter.
Mushrooms and flour being stirred in a skillet for a Thanksgiving crockpot casserole
  1. Stir. Add the flour, and let it cook for a couple of minutes.
Creamy mushrooms for crockpot green bean casserole without mushroom soup
  1. Pour in the Milk. Add the spices. Cook and stir until bubbly. Add the vinegar.
Creamy mushrooms over green beans
  1. Pour the Sauce Over the Beans. It’s almost time to cook!
Crockpot green bean casserole with mushrooms
  1. Stir and Cook. Cook on LOW for 3 to 5 hours. Just before serving, add the cheese. Top with crispy onions. DIG IN!

Recipe Variations

  • To Make Gluten Free. This is not a gluten free crockpot green bean casserole as written. However, I think you could swap the all-purpose flour for a 1:1 gluten free flour to make it gluten free. Be sure to check your fried onions too.
  • To Make Vegan. I have not tried to make this a vegan crockpot green bean casserole, but if you want to experiment, you’ll need to use dairy-free milk, cheese, and butter.
A baking dish of healthy crockpot green bean casserole

Storage Tips

  • To Store. Refrigerate the casserole in an airtight storage container for up to 4 days. 
  • To Reheat. Rewarm leftovers in a baking dish in the oven at 350 degrees F. 
  • To Freeze. Freeze green bean casserole in an airtight freezer-safe storage container for up to 3 months. Let thaw overnight in the refrigerator before reheating. The crispy onions will become soggy (if using), but the casserole will still taste delicious. 

Make Ahead Tips

Prepare the mushroom sauce up to 1 day in advance, and place it in an airtight container in the refrigerator. Trim and cut the green beans up to 2 days in advance, and store them in a separate container in the refrigerator. 

You can mix up green bean casserole the night before too. Add the trimmed and cut green beans to a slow cooker, and stir them together with the mushroom sauce. Cover and refrigerate the slow cooker for up to 1 day, then finish the recipe as directed.

Crockpot green bean casserole with fresh green beans

Leftover Ideas

Turn this leftover crock pot green bean casserole recipe into a hearty main dish. Enjoy crockpot green bean casserole with chicken or leftover turkey or ham.

Cheesy crockpot green bean casserole with crispy onions

What to Serve with Green Bean Casserole

Pair this casserole with other delicious sides (like Cornbread Stuffing and Healthy Sweet Potato Casserole) and one of these tasty mains!

Crockpot green bean casserole
  • Slow Cooker. This one switches to “warm” to deter overcooking.
  • Saucepan. You’ll use this kitchen tool on repeat.
  • Measuring Spoons. Since these are double-sided, you’ll have less to wash after you make this cheesy green bean casserole.
Green bean casserole in a crockpot

Recipe Tips and Tricks

  • NO Canned Green Beans. If you aren’t able to use fresh green beans, opt for frozen, cut green beans instead. Canned green beans will end up mushy.
  • Don’t Skip the Sherry Vinegar. With its mild acidity and wonderfully nutty flavor, sherry vinegar subtly elevates this dish. It’s worth grabbing a bottle for this casserole (and any of these recipes that use it)!
  • Make It Ahead. Let this casserole be your holiday meal MVP! Not only does it free up your oven space, but it also can be made in advance. See the “Make Ahead Tips” box above for ideas.

Crockpot Green Bean Casserole

4.95 from 20 votes
How to make Crockpot Green Bean Casserole from scratch. Fresh green beans and an easy homemade creamy filling make this recipe the best!

Prep: 20 minutes
Cook: 5 hours 30 minutes
Total: 5 hours 50 minutes

Servings: 10 servings

Ingredients
  

FOR THE CASSEROLE:

  • 2 pounds fresh green beans
  • 2 tablespoons unsalted butter
  • 1 medium yellow onion thinly sliced
  • 16 ounces baby bella mushrooms thinly sliced
  • 3 tablespoons all-purpose flour
  • 2 cups whole milk a lower fat milk may curdle, so swap at your own risk; for more decadence, use part half-and-half
  • 1 teaspoon kosher salt
  • 1/2 teaspoon black pepper
  • 1/8 teaspoon ground nutmeg
  • 1 tablespoon sherry vinegar
  • 1 cup shredded cheddar cheese or gruyere cheese*

FOR THE TOPPING:

  • 1 1/2 cups fried onions store bought or homemade; to make your own, see blog post above; about 3 ounces

Instructions
 

  • Trim the green beans and cut into 1-inch pieces (don’t be tempted to cut them larger than this, or your green beans will turn out too firm). Add them to a 5 or 6-quart slow cooker.
  • Melt the butter in a wide saucepan over medium heat. Add onion and mushrooms. Cook, stirring occasionally, until the onion is soft and golden and the mushrooms brown and have given up their liquid, about 12 minutes.
  • Sprinkle the flour over the top. Cook, stirring constantly, for 1 to 2 minutes more, until all of the flour turns golden and no white bits remain. The vegetables will seem dry.
  • Slowly add the milk a few splashes at a time, stirring between each addition to prevent lumps from forming. Increase the heat to medium high. Stir in the salt, pepper, and nutmeg. Cook and stir, allowing the sauce to bubble gently, running a wooden spoon or rubber spatula along the bottom of the pan. Continue cooking and stirring for 6 minutes, then stir in the sherry vinegar. Cook 2 to 4 more minutes, until the sauce has thickened to resemble a creamy gravy. It should be clearly thicker than it was when you started, but still be loose enough to easily coat the green beans.
  • Pour the sauce over the green beans.
  • Stir to combine. Cook on LOW for 3 to 5 hours, until the green beans are pleasantly tender but still have a bit of crispness (i.e. are done but not mushy). The amount of cook time you need will vary based on your slow cooker and your preference for how al dente you like the green beans. I recommend checking at the 3-hour mark to gauge their progress. We like our green beans pretty crisp, so I only let ours cook a little beyond 3 hours. If at 3 hours you'd like your green beans more done, give the casserole a stir, recover, and keep cooking until they reach your desired texture.
  • Five minutes prior to serving, stir in the cheese. Recover, turn to WARM, and let cook 5 minutes to melt the cheese.
  • Immediately before serving, if desired, transfer the green beans and sauce to a serving dish. Sprinkle the fried onions over the top (if you will be serving right out of the slow cooker, remove the lid, then sprinkle the onions on top of the green beans in the slow cooker). Enjoy hot!

Notes

  • *I love either gruyere or cheddar here; gruyere is more intense and nutty and tastes classic with the nutmeg; cheddar is more “all-American”, so choose whichever one you and your family prefer.
  • TO MAKE AHEAD: Prepare the mushroom sauce up to 1 day in advance, and place it in an airtight storage container in the refrigerator. Trim and cut the green beans up to 2 days in advance, and store them in a separate container in the refrigerator.
  • You can also add the trimmed and cut green beans to a slow cooker, and stir them together with the mushroom sauce. Cover and refrigerate the slow cooker for up to 1 day, then finish the recipe as directed.
  • TO STORE: Refrigerate the casserole in an airtight storage container for up to 4 days. 
  • TO REHEAT: Rewarm leftovers in a baking dish in the oven at 350°F. 
  • TO FREEZE: Freeze green bean casserole in an airtight freezer-safe storage container for up to 3 months. Let thaw overnight in the refrigerator before reheating. The crispy onions will become soggy, but the casserole will still taste delicious. 

Nutrition

Serving: 1(of 10)Calories: 199kcalCarbohydrates: 17gProtein: 8gFat: 12gSaturated Fat: 7gCholesterol: 23mgPotassium: 486mgFiber: 3gSugar: 7gVitamin A: 888IUVitamin C: 12mgCalcium: 181mgIron: 1mg

Join today and start saving your favorite recipes

Create an account to easily save your favorite recipes and access FREE meal plans.

Sign Me Up

Frequently Asked Questions

Why Is My Green Bean Casserole So Soupy?

If your casserole is soupy, it’s likely because there was excess water in your ingredients. If you’re washing them first, sure you allow the green beans and mushrooms to dry completely before you begin the recipe. Also, a soupy green bean casserole could mean there wasn’t enough flour added.

To rectify a soupy casserole situation, try adding in extra flour. Start with just a little, then add more if needed. It’s also important to note that green bean casserole will thicken as it cools, so if your casserole isn’t too soupy, you may want to let it sit awhile to see if that helps.

Is Crockpot Green Bean Casserole Healthy?

As far as green bean casserole goes, this recipe is relatively healthy. It’s packed with fiber, vitamin C, and protein from the green beans, and the cheese brings some calcium. Dig in and enjoy!

Can I Use Canned or Frozen Green Beans?

Frozen, cut green beans are the next best option to fresh. If you’d like to save some time, you can purchase a bag of cut, frozen green beans. Steam them according to the package instructions and pat them very dry before adding them to the slow cooker. They will be a little mushy, but certainly not inedible.

AVOID canned green beans. Canned green beans will make your casserole mushy and inflict a metallic, stale flavor. If you haven’t liked green bean casserole in the past, the recipe likely used canned green beans. Green bean casserole is better with fresh green beans (or frozen), not canned.

Do I Need to Blanch the Green Beans?

No. While some crockpot fresh green bean casseroles call for blanching the green beans before adding them to the slow cooker, to me this took away the slow cooker’s ease. After some playing around, I found by cutting the green beans into 1-inch pieces, I could cook them directly in the slow cooker without steaming or blanching. The green beans softened nicely, and we didn’t have any problems with hard pieces.

More Crockpot Holiday Sides

Did you try this recipe?

I want to see!

Follow @wellplated on Instagram, snap a photo, and tag it #wellplated. I love to know what you are making!

You May Also Like

Free Email Series
Sign Up for FREE Weekly Meal Plans
Each includes a grocery list, budget, and 5 healthy dinners, helping you save time, save money, and live better!

Erin Clarke

Hi, I'm Erin Clarke, and I'm fearlessly dedicated to making healthy food that's affordable, easy-to-make, and best of all DELISH. I'm the author and recipe developer here at wellplated.com and of The Well Plated Cookbook. I adore both sweets and veggies, and I am on a mission to save you time and dishes. WELCOME!

Learn more about Erin

Leave a Comment

Did you make this recipe?

Don't forget to leave a review!

Your email address will not be published. Required fields are marked *

Recipe Rating




28 Comments

Leave a comment

    1. Jenny, I think you could experiment with almondmilk, but just a heads up that your sauce will not be as thick and creamy. I’ve only tested it (and thus can only 100% recommend the recipe) with regular milk. If you do decide to play around though, I’d love to hear how it goes!

    2. I very much appreciate this recipe for so many reasons! No canned soup! No oven space required. Great fresh flavor. Make ahead options! I did use my Instant Pot on Slow Cook mode and it did 5 hours. I opted to make the sauce the day before and toss it into the Cooker with the chopped green beans, stir and cook. This dish was a total hit. One guest said she thought she didn’t like green bean casserole but has now changed her mind! The fried onion topping was a must for this crowd. Yay!5 stars

  1. I’m wondering why you suggest steaming frozen beans according to the package directions instead of just letting them thaw and drop them into the slow cooker? Would it seem like it would yield a result closer to using fresh beans? (I have a pound of fresh and, rather than running back into town to the grocery store, I figure I can just supplement it with a pound of frozen.)

    Also, any thoughts about subbing fresh pearl onions for the onions in the recipe? My son-in-law doesn’t like onions. (It’s a texture thing, not a taste thing.) He can more easily remove the pearl onions… I’ve not really used pearl onions before so I’m unsure about how to go about subbing them… I welcome any suggestions you have…

    1. Hi Mark! I haven’t tried making the beans the way you suggest, but you could experiment with it if you prefer. I think you could swap in pearl onions, but it will change the texture of the casserole a bit. I’d love to hear how it goes if you try it!

      1. Follow up… The pearl onions worked quite well, although next time I would save some work and use frozen (the extra step of boiling the raw pearl onions isn’t really worth it). I added crumbled bacon because, well… bacon. Subbed corn starch for the flour because my daughter is gluten intolerant.

        The gruyere cheese is what really makes this recipe, I think. I was lucky in that I had a half pound of it in my refrigerator looking for a use. I love cheddar but think gruyere makes this unique among green bean casseroles that I’ve tried.

        We had planned on a socially distanced Thanksgiving meal on the front porch but my daughter was afraid she had been exposed to the virus so we postponed a week. (Testing later showed she wasn’t but file it under better safe than…) As the following Thursday was much colder, we met for a walk in the woods, returned to our house for pie on the porch and sent the two kids and their spouses home with prepackaged Thanksgiving dinners. Not optimal but that’s life in the age of C.5 stars

  2. Happy Thanksgiving Eve, Erin! The past several months have taught me to embrace the ingredients I have, but I do not want to make a cooking mistake with a new recipe tomorrow. May I omit the cheese? May I use balsamic or white balsamic vinegar? Thank you for your guidance.

    1. Hi Amy! I”m so pleased to hear you are enjoying trying new things. I love this most with the cheese, but you can omit it if you truly prefer; it will be a little less creamy and rich. If you do not have sherry vinegar, I think white balsamic will work or you can simply omit it. I hope you enjoy it!

      1. omg the mushroom sauce was AMAZING!!! So much better than canned condensed soup. Thanks for a great spin on on old classic. It was delicious. Still used French’s french fried onions though ;)

        Also I used red wine vinegar and it was great.5 stars

  3. This recipe was fantastic! I made it vegan by skipping the butter and using only oil, swapped dairy milk for Almond milk and vegan cheddar. It was unreal! Everyone loved it. Thank you so much! My sister hasn’t had green bean casserole in years and was so happy!5 stars

  4. I made this casserole on Thanksgiving and it was delicious! I made it with white sharp cheddar cheese and used a can of store bought fried onions. This was an easy and delicious side and I will definitely be making it with other holiday meals in the future! Thank you for this awesome recipe!5 stars

  5. I’m slightly confused about making this ahead of time and freezing. Do I make the whole recipe, cook it, let it cool and freeze, and reheat in crock pot?

    1. Hi Janet! Freeze green bean casserole in an airtight freezer-safe storage container for up to 3 months. Let thaw overnight in the refrigerator before reheating. The crispy onions will become soggy, but the casserole will still taste delicious. Rewarm leftovers in a baking dish in the oven at 350 degrees F. Hope this helps!

  6. I can I double or even triple the recipe all in one big crockpot with out sacrificing the taste? Would you make any changes?

    1. You should be able to double or triple easily if you have a crockpot big enough to fit the ingredients. I wouldn’t make any changes.

  7. Did a trial run for Thanksgiving. Glad to be using the crockpot. These were delicious! Opted for the Gruyère and was very pleased.5 stars

  8. I realize this recipe was posted 3 years ago but I plan to make it this Thanksgiving so hopefully someone is seeing this. :) The recipe says to cook on low for 3-5 hours. That is a really big range of time – especially when trying to time this to be done with all of the other items. Can anyone tell me exactly how long this took to cook once you turned the slow cooker on low? Thanks!

    1. Julie, I’m sorry but there isn’t a way to be exact because slow cooker models vary so much. I use a regular Crockpot 6 quart (It’s maybe 5 years old?); it tends to finish on the early end of recipes with a range, so for me this was done around the 3 to 3 1/2 hour mark. I’d judge based on how your slow cooker usually finishes up relative to the recipes you follow. Sorry I can’t be more specific but I hope this helps a little bit. Happy Thanksgiving!