‘Tis the time of year to celebrate togetherness, good cheer, and quite notably, appetizers. Pop a few Mushroom Puff Pastry Bites into your mouth, and let’s rejoice!

Mushroom Puff Pastry Bites with onions, mustard, and gruyere cheese

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The holidays are prime season for dips, chips, and all sorts of cute little morsels made to be munched in a single chomp like today’s mushroom puff pastry bites.

Whether you’re hosting a soiree, feeding surprise guests, or drifting from party to party in your light-up snowman sweater, the appetizer spread is a critical component of any holiday event.

I mean, a party without Crab Stuffed Mushrooms or Salmon Croquettes is just sad—right?!

My go-to easy appetizer: puff pastry anything.

Cheesy Mushroom Puff Pastry Bites with caramelized onions

5 Star Review

“This appetizer is a timeless hit. It was delicious, and everything you promised. The combinations of flavored garnish it a perfect five stars.”

— Giselle —

Ever since making these Cranberry Brie Bites, I’ve been smitten with puff pastry as the ideal vehicle for all manners of tasty toppings.

  • Flakey, buttery, and universally appealing, frozen puff pastry is an effortless shortcut that is nonetheless impressive and irresistible.
  • Leave large for an Easy Asparagus Tart or use a baby biscuit cutter to create bite-sized, poppable hors d’oeuvres.
  • Sweet or savory—both are splendid options. Why not make both? Try Pesto Pinwheels for a starter and Puff Pastry Cinnamon Rolls for dessert!

For today’s puff pastry bites, I’m keeping things savory with caramelized onions, tender earthy mushrooms, and flavorful Gruyere cheese.

Better call some guests over because these mushroom puff pastry bites are about to be all dressed up and need a place to go!

Cutting frozen puff pastry with a small round biscuit cutter

How to Make Mushroom Puff Pastry Bites

With aged Gruyere, slightly crisp caramelized onions, tender earthy mushrooms, and slightly, and puffed golden pastry, these mushroom puff pastry bites won’t last long at your next event (better bring a batch of these Brie Bites for backup).


The Ingredients

  • Frozen Puff Pastry. A versatile freezer staple that can be used to make stuffed pockets of joy (ahem, Salmon Wellington), or, an even easier option, mini pizza-like tarts smothered it in tasty toppings.
  • Mushrooms. Earthy, tender, and aromatic, I went for everyday baby bella (aka crimini) mushrooms for these savory little tartlets, just like I used in Mushroom Soup. (If you love mushroom apps, definitely try Sausage Stuffed Mushrooms or Crab Stuffed Mushrooms).
  • Onions + Garlic. Adding caramelized onions to any appetizer with a hint of garlic somehow adds at least 10 fancy points to any recipe.
  • Mustard. A small dollop of zippy whole grain mustard on each puff pastry round adds a little zip.
  • Gruyere. This pungent, aged cheese tastes and smells AMAZING as it melts and pairs perfectly with the mushrooms. Swiss or an extra sharp cheddar would also be nice options. (It’s also divine in these Crab Artichoke Toasts)
  • Thyme + Parsley. For color, freshness, and a little extra woodsy aromatic flair.
  • Egg. Adds shine to each puff pastry piece as it bakes.
Assembling puff pastry bites with mushrooms and mustard

The Directions

  1. Caramelize the onions. Set aside.
  2. Sauté the mushrooms, then add garlic, thyme, and black pepper.
  3. Combine with the onions and stir in the cheese.
  4. Roll out the puff pastry and cut into 50 equal-sized rounds or squares.
  5. Brush the pastry with an egg wash, prick each with a fork, then top lightly with the mustard, and mushroom mixture.
  6. Bake until the pastry is golden and crisp. ENJOY!
Easy Mushroom Puff Pastry Bites with Caramelized Onions and herbs on parchment

Storage Tips

  • To Store. Puff pastry bites may be kept refrigerated for up to two days in an airtight container.
  • To Reheat. To warm and crisp up chilled mushroom puff pastry bites, bake in a 400 degree F oven for 3-5 minutes until heated through.

Make Ahead

Option 1

  • Fully bake the mushroom puff pastry bites, as directed, then place them in an airtight container separating any layers with parchment or wax paper, and freeze for up to two weeks.
  • To serve, reheat directly from frozen in a 400 degree F oven for 5 minutes, or until hot.

Option 2

  • The mushroom onion topping can be prepped and refrigerated 2 days in advance.
  • When ready to bake, top the puff pastry with the mushroom mixture and finish the recipe as directed.
A platter of Mushroom Puff Pastry Bites with gruyere

So where’s the party? I have a platter of mushroom puff pastry bites in hand.

Frequently Asked Questions

How To Get Puff Pastry to Rise Evenly?

Take care when brushing the puff pastry with egg wash before baking. Try to keep it only on the top and don’t let it run down the sides. If egg wash runs down the sides, it will harden as it bakes and can act like glue to bind the layers of pastry together.

Why Do You Prick Puff Pastry with a Fork Before Baking?

Pricking the puff pastry with a fork before baking allows for steam to escape while the mushroom bites bake. Trapped steam is what gives puff pastry its rise, allowing some to escape controls the rise so the bites remain a manageable size and shape.

Can I Make the Puff Pastry from Scratch?

Absolutely! If you have a knack for pastry making and the time to do so, by all means, make the puff pastry from scratch. I’m sure it would be delicious!

Cheesy Mushroom Puff Pastry Bites with Caramelized Onions

Mushroom Puff Pastry Bites

5 from 5 votes
Vegetarian mushroom puff pastry bites with Gruyere and mustard are an easy, crowd-pleasing appetizer perfect for parties and holidays.

Prep: 10 mins
Cook: 1 hr 10 mins
Total: 1 hr 25 mins

Servings: 50 bites

Ingredients
  

  • 2 tablespoons extra virgin olive oil divided
  • 1 large yellow onion thinly sliced
  • 1/2 teaspoon kosher salt
  • 16 ounces baby bella mushrooms sliced
  • 1/2 teaspoon minced garlic
  • 2 teaspoons finely chopped fresh thyme leaves or 1/2 teaspoon dried
  • 1/4 teaspoon ground black pepper
  • 1/2 cup shredded Gruyere Swiss, or similar cheese (about 1 1/2 ounces)
  • 2, 10- inch square sheets frozen puff pastry thawed
  • 1 egg beaten
  • 3 tablespoons whole-grain mustard
  • Chopped fresh parsley for garnish

Instructions
 

  • Place racks in the upper and lower thirds of your oven and preheat the oven to 400 degrees F. Line two large baking sheets with silicone baking mats or parchment paper. Set aside.
  • In a large skillet over medium-low heat, heat 1 tablespoon olive oil and add the onions and salt. Sauté the onions until beginning to brown, then reduce heat to low and continue to cook, stirring occasionally, until deeply golden and caramelized, about 25 minutes total. Remove the onions to a large bowl and set them aside.
  • In the same skillet, heat the remaining tablespoon olive oil over medium-low and sauté the mushrooms until tender, about 5 minutes. Add garlic, thyme, and black pepper and sauté for 1 additional minute. Place in the bowl with the onions. Stir in the cheese.
  • On a lightly floured work surface, roll out the puff pastry into an even 10.5-inch square. With a 2-inch round cookie or biscuit cutter, cut the pastry into rounds (alternatively, you can slice the puff pastry into squares to limit waste). You should have approximately 5 rows of 5 rounds (25 total rounds per sheet).
  • Transfer the cut puff pastry to a prepared baking sheet, then brush lightly with the beaten egg. Prick each round with a fork to allow air to escape, then top each round with a scant 1/4 teaspoon of the whole grain mustard, then 1 tablespoon of the mushroom and onion filling. Repeat with the second pastry sheet.
  • Bake for 25 minutes, until the pastry is golden and crisp, rotating the pans 180 degrees and switching the positions of the baking sheets on the upper and lower racks halfway through. Let bites cool for 5 minutes. Garnish with fresh parsley and serve warm or at room temperature.

Notes

  • TO STORE: Puff pastry bites may be kept refrigerated for up to two days in an airtight container.
  • TO REHEAT: To warm and crisp up chilled mushroom puff pastry bites, bake in a 400 degree F oven for 3-5 minutes until heated through.
  • TO MAKE AHEAD: Fully bake the mushroom puff pastry bites, as directed, then place them in an airtight container separating any layers with parchment or wax paper, and freeze for up to two weeks. To serve, reheat directly from frozen in a 400 degree F oven for 5 minutes, or until hot. Alternatively, the mushroom onion topping can be prepped and refrigerated 2 days in advance. When ready to bake, top the puff pastry and finish the recipe as directed.

Nutrition

Serving: 1(of 50)Calories: 69kcalCarbohydrates: 5gProtein: 2gFat: 5gSaturated Fat: 1gPolyunsaturated Fat: 1gMonounsaturated Fat: 3gTrans Fat: 1gCholesterol: 5mgPotassium: 54mgFiber: 1gSugar: 1gVitamin A: 22IUVitamin C: 1mgCalcium: 18mgIron: 1mg

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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!

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