The Very Best Monster Cookies

Yesterday, I realized that I have been baking these Monster Cookies for 10 years, which made me feel…old. BUT not old enough to skip silently evaluating every single cookie and carefully selecting the one with the most chocolate. 

BEST Monster Cookies recipe. Thick, soft, and chewy peanut butter oatmeal cookies, stuffed with chocolate chips, M&M candies, and peanut butter chips. Our favorite cookie recipe!

Considering I grew up with flour on my shirt and chocolate on my face, I am sure I have many recipes in my life that I’ve been baking for longer than 10 years, but I remember the first time I tasted these Monster Cookies especially vividly.

I was introduced to these thick, chewy Monster Cookies by my first ever “work friend” (a.k.a. real friend who happened to have a cubical in my vicinity), Lindsey.

Lindsey brought a batch of the most perfect Monster Cookies in creation to the office and, as soon as I could come up for air after devouring what I told myself was three Monster Cookies but what was mathematically closer to five, I asked her for the recipe. She told me it was her mom’s and she’d get it to me soon.

I’m not sure how far back the recipe lineage continues (Lindsey got the recipe from her mom, who got it from her mom, etc.), but I would not be surprised if these easy Monster Cookies dated back to the invention of chocolate and peanut butter. They are perfect in that special way that tastes of the fine tuning of generations.

Thick, soft, chewy Monster Cookies recipe

I originally shared this Monster Cookies recipe five years ago. Today, I’m giving it a facelift with fresh photos and a new video, because these Monster Cookies are every bit as fabulous as I am making them out to be.

They’re supremely ooey-gooey, thick and chewy, and jam-packed with bits and bites of chocolate and peanut butter in various forms (chips, candies, and straight-up PB). They deserve all of the dramatic statements you care to throw their way.

I’ll start.

Best Monster Cookies EVER.

^^Said it. Standing by it.

Easy Monster Cookies with oatmeal, peanut butter, and M&M candies. Better than Pioneer Woman!

Lindsey mom’s original name for this recipe is “nutritious cookies” because of redeeming ingredients like peanut butter and oatmeal. The original recipe does not include M&Ms, but I’ve taken to adding them for color and crunch…and because it’s hard to imagine a good reason not to include more chocolate.

Now, I can’t in good faith type that these Monster Cookies are *quite* as nutritious as say, this giant Healthy Peanut Butter Cookie or these Peanut Butter Protein Cookies.

I have, however, made a few tweaks over time to put the recipe above the nutritional profile of Monster Cookies Pioneer Woman or Monster Cookies Paula-style, such as using whole wheat flour.

Easy Monster Cookies. Soft, chewy, and perfect every time!

I prefer baking my Monster Cookies bite-sized (then, ahem, eating more), but if you prefer giant Monster Cookies, you can certainly scoop the dough larger and extend the bake time by a few minutes.

As far as mix-ins go, Monster Cookies traditionally call for chocolate chips and M&M candies, but I follow Lindsey and her mom’s move of adding peanut butter chips to the mix too. The double hit of PB is the secret to making these the best, most addictive Monster Cookies you’ll try.

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Easy Monster Cookies. Soft, chewy, and perfect every time!
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Monster Cookies

Yield: 36 -40 small (2-inch) cookies
Prep Time:
20 mins
Cook Time:
10 mins
Total Time:
30 mins
The BEST Monster Cookies recipe ever! Thick, soft, chewy and PACKED with chocolate chips, peanut butter chips, and M&M candies. Easy and perfect!


  • 1/2 cup (1 stick) unsalted butter, softened
  • 3/4 cup firmly packed dark brown sugar
  • 1/4 cup granulated sugar
  • 1/2 cup creamy peanut butter
  • 1 large egg — at room temperature
  • 1 teaspoon pure vanilla extract
  • 1/2 teaspoon baking soda
  • 1/4 teaspoon kosher salt
  • 1 cup  white whole wheat flour —  or whole wheat pastry flour
  • 1 cup old fashioned rolled oats
  • 3/4 cup dark chocolate M&Ms
  • 1/2 cup semi-sweet or dark chocolate chips
  • 1/2 cup peanut butter chips


  1. In a large mixing bowl, cream butter, brown sugar, and granulated sugar until light and fluffy, about 3 minutes. Add peanut butter and beat until fluffy again, about 2 minutes, scraping down the bowl as needed. Beat in egg and vanilla until combined.
  2. Sprinkle the baking soda and salt over the top. With the mixer on low, gradually add the flour, mixing just until the flour disappears. Slowly beat in the oats. By hand, stir in the M&Ms, chocolate chips, and peanut butter chips. If time allows, chill dough for 30 minutes or overnight.
  3. When ready to bake, place racks in the upper and lower thirds of the oven and preheat the oven to 350 degrees F. Line two cookie sheets with parchment paper or a silicone baking mat. Drop cookies onto the sheets by rounded tablespoons. Bake for 10 minutes in the upper and lower thirds of the oven, until lightly golden brown (cookies may appear underdone). Let rest on cookie sheet for 5 minutes, then transfer to a wire rack to cool. Serve with a big glass of cold milk.

Recipe Notes

  • Store leftover Monster Cookies in an airtight container for up to 1 week or freeze for up to 3 months. Let thaw overnight in the refrigerator, then transfer to the counter.
  • To freeze unbaked cookies: portion the dough into balls and arrange on a parchment-lined baking sheet. Place the sheet in the freezer until the dough is firm, then transfer to an airtight container or freezer-grade ziptop bag and freeze for up to 3 months. Bake directly from frozen, adding to the baking time as needed.
Course: Dessert
Cuisine: American
Keyword: Chewy Cookie Recipe, Monster Cookies

Nutrition Information

Amount per serving (1 (of 38)) — Calories: 126, Fat: 8g, Saturated Fat: 4g, Cholesterol: 12mg, Carbohydrates: 14g, Fiber: 1g, Sugar: 10g, Protein: 2g

Did you try this recipe? I want to see! Follow Well Plated on Instagram, snap a photo, and tag it #wellplated. I love to know what you are making!

This post contains some affiliate links, which means that I make a small commission off items you purchase at no additional cost to you.

About Erin Clarke

I’m fearlessly dedicated to making healthy food taste incredible. Wearer of plaid, travel enthusiast, and firmly convinced that sweets and veggies both deserve a place at the table. MORE ABOUT ERIN…


  1. Monster cookies are SO good! Love that you snuck whole wheat flour in here too.

  2. Monster cookies are always so good. I can’t meant to try these!!

  3. I have never made monster cookies but they always look so incredible! I am pinning this recipe for sure!

  4. haha my sister and I did the exact same thing as kids. She liked nerds and sour patch kids and I was always about the chocolate/peanut butter combo. And we also clearly blasted halloween music while doing this – monster mash anyone??

    I love these cookies – I haven’t made monster cookies in far far too long.

  5. Me amnd my mom have said many times that monster cookies truly are the best cookies. Ever. I think it is the oats and MnMs. I’ve never made them with pb chips and will definitely throw those in next time. So true about single serving … haha, there is no such thing!

  6. Well, you had me at chocolate and peanut butter! These look amazing, and since I haven’t made monster cookies in ages, they are totally going on the “to-make” list.

  7. Okay, I have a confession… I never really jumped on the M&M’s-in-a-cookie band wagon… but I think that is all about to change. I was all about the peanut butter and chocolate as a kid, too (and still am!), and these cookies sound over-the-top in the best possible way. And they are so cute and tiny! I would eat a dozen without thinking twice. Nom!

  8. consuelohoneyandfigs Reply

    I love how fun these look and I’m definitely a sucker for the pb + chocolate + oats combo, but it’s super dangerous for me to have m&m’s around, because I always eat them all before putting them in the cookies oooOOooops. They’re so yummy, it’s impossible to stop at one ;)

  9. I love a good monster cookie! I was, and still am, only in the Halloween spirit for the pb & chocolate candy (Reese’s were like hitting the jackpot, let’s face it), but now that I am old enough to buy my own and bake them into cookies, that Halloween happiness can last year round.

  10. Monster cookies kind of own my heart! You’re sending some my way right?!

  11. I am not too crazy about sweet and sour variety either. If we were sisters, it would not have ended well :P

  12. These look awesome! Monster cookies are one of my favorites. In my experience they’re really good for shipping during the holiday season too since they are sturdy and stay nice and chewy for a few days!

  13. I love monster cookies! I actually can’t believe I don’t even have a recipe on my blog for it. They’re definitely one of my absolute favorite cookies that remind me of childhood! I remember they were all I wanted to make. Yours looks fabulous!

  14. Halloween is made for monster cookies! I like to throw every candy I can into this dough and call it supper.

  15. Who doesn’t love M&Ms? These monster cookies look awesome!

  16. I LOVE monster cookies! They are so easy, fun and adaptable. These are perfect for Halloween!!!

  17. Well I know what I’m doing with our left over Halloween candy!! These are wonderful Erin! Pinning for Friday!

  18. What a great way to use up Halloween candy! Plus I’m a sucker for anything with peanut butter chips – I love those little things! These look so good

  19. I love Monster cookies. The texture, the oats, the M&Ms! Yes! :)

  20. They look oh so good. I’m sure my kids would love me forever if I made them these. Well, maybe not forever but at least the rest of the day. ;)

  21. Monster Cookies are one of my all-time favorite desserts! I’ve never made them with peanut butter chips so I can’t wait to try your version!

  22. Oh. My. Yum! These cookies look delicious! Fingers crossed the trick-or-treaters leave me enough M&M’s so I can make these this weekend.

    And thanks for commenting on my blog. Now I’ve found yours and I love it! Adding you to my reader. Can’t wait to see what you make next : )

  23. Monster cookies are my absolute favorite cookies! Can’t wait to try your version!

    • Thanks Jessica!!!! I was obviously way excited about them, lol. If you give them a try, I’d love to hear what you think! If they are your fave, you’ll be a great judge :)

  24. Oh my goodness, look at these gorgeous little colorful gems! You’ve totally taken me back with these cookies, Erin. They’re dangerously easy, so I’ve gotta give them a go!

  25. These monster cookies look perfect, I love how fun they are. Definitely on the list of sweets to make!

  26. I NEVER make cookies but I think I’ll have to try these. I adore PB&C.

    Would it be inappropriate to steal my kid’s Halloween candy to make these? Or worse, hypocritical if I were to forbid candy but let him eat candy in a cookie? Ah, the great dilemmas in parenting…

    • Sarah, if you adore PB&C, these cookies have your name written all over them! Mega parental conflict. I think if you steal the candy, give your kiddos a cookie or two, then hide the rest for your personal midnight snack needs, everyone will walk away happy ;-)

  27. Ohhh how I wish I could go trick-or-treating tomorrow just to get candy for these cookies!! Guess I’ll be one of the crazies raiding the discounted Halloween candy!

  28. Hi Erin! These cookies are loaded with all sorts of goodness! I would have a hard time not eating the entire batch! Thank you for sharing them with us!

  29. OMG! These are packed with goods. So delicious

  30. I have such great memories of candy sorting and swapping- maybe the best part of Halloween! These cookies look like perfection :-)

  31. I’ve never heard of a monster cookie. Clearly, I had a huge deficit in my early development (I need to remedy that now by eating as many of these cookies as possible, just so… well, I get a good idea as to how wonderful they are). One problem: peanut butter chips don’t exist in Australia *waaaah!*. Should I just omit them altogether or should I add something else? xx

    • Peanut butter chip tragedy! You need to come to the states and stock up ASAP Laura ;-) Feel free to swap out the PB chips for whatever mix ins you like: more chocolate chips, butterscotch chips, chopped candy bars, or if you want to add more PB flavor, chopped peanuts would be delicious too. That’s the beauty of monster cookies: they transform to fit your pantry!

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  37. These sound so good! Just wondered – can I use all purpose flour instead of whole wheat? It’s all I have at home right now. Thank you!

  38. Thank you, Erin, for the you tube. That was very helpful! I’ve made monster cookies before but found new tips I am eager to apply, like place in the fridge those 30 mins. before baking. I also appreciate the way you give explanations, ex., using dark brown sugar. I have never used that. Needless to say, I am eager to try Monster Cookies in the near future!! Very near! :)

  39. Monster cookies are my ALL TIME favorite cookie!! I loved coming up with a healthier version too :)

  40. These cookies look so delicious and so easy to make! Perfect for kids!

  41. Monster cookies are SUCH a staple!!

  42. Just needs 1/2 tsp salt: otherwise good

  43. Oh my word!!! I can not stop eating these….so yummy!!! 
    I do have to admit I only had dark choc chips to put in them so I’m sure they’re not as good as they could be. It’s a perfect ratio of peanut butter, oats & chocolate! Thanks for another fab recipe!! 

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