Savory Puff Pastry Bites with Caramelized Onions and Mushrooms

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These Puff Pastry Bites with caramelized onions and mushrooms are a savory appetizer that hits all the right flavor notes and are just perfect to make for holiday entertaining! Although there are several steps required to assemble these tasty morsels, the results are well worth the effort.

A white plate of the puff pastry bites topped with caramelized onions, mushrooms, cheese, and a sprinkle of herbs. Text overlay says"How to Make Caramelized Onion & Mushroom Puff Pastry Bites". Similar photos of the recipe/dish from various angles are used throughout and with different text overlay unless otherwise described.

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Puff Pastry Bites

The full ingredients list and instructions are found in the printable recipe card at the end of this post. I highly recommend reading the blog post all the way through so that you don’t miss any tips or substitution suggestions; to ensure that you have all the ingredients and equipment required, and to understand the steps and timings involved.

Portobello mushrooms, marsala wine, onions, puff pastry, and smoked cheddar round out the ingredients for this savory and delectable party appetizer that is just perfect for this time of year.

Although there are several steps required to assemble these tasty morsels, the results are well worth the effort and your guests will love them!

To save time when making this appetizer, you can caramelize the onions a day or two before your event.

This recipe is designed to give you plenty of leftover caramelized onions because of the time it takes to get them just right. Store unused portion in an airtight container in the refrigerator for up to one week or freeze for later use.

Caramelized onions are wonderful on sandwiches, in soups, or on top of your favorite pizza.

Mushroom Puff Pastry Bites

Ingredients & Equipment Used In This Recipe

You may already have some of the basic ingredients for this recipe – the full list with measurements is found in the recipe card at the end of this post.

For your convenience, any specialized or notable ingredients and equipment needed for this recipe have been listed below and linked to Amazon if available online.

  • Fresh Produce – portobello mushrooms, onions, thyme
  • Marsala Winea fortified wine often used in cooking. You could also use dry sherry.
  • Dry White Wine – use your favorite white wine.
  • Puff Pastry easier to just buy this than try to make it! Puffs up in size when it bakes.
  • All-Purpose Flouralso known as Plain Flour.
  • Applewood Smoked Cheddar – or you could use a regular Cheddar if you prefer.

Recipes on The Purple Pumpkin Blog use both cup measurements and/or weighted measurements. American cups and kitchen food scales are handy pieces of equipment to have in your kitchen as it means you’ll be able to make all of the different recipes on my blog! I try to give American, imperial, and metric measurements in my recipes. You can mix cup measurements with weighted measurements, but never imperial (pounds, ounces, pints, etc.,) with metric (kilograms, grams, liters, etc.,).

Recipe for Caramelized Onion & Mushroom Puff Pastry Bites

More Recipes Using Mushrooms

One of the hero ingredients in this recipe is mushrooms, so here are some more recipes using the same:

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More Party Appetizer Recipes

Looking for more party appetizers to make? Check these recipes out next:

Caramelized Onion & Mushroom Puff Pastry Bites

Puff Pastry Bites Recipe Tips

Here are some pre-planning tips when making these appetizers:

  • Save time by caramelizing the onions a day or two before preparing this recipe.
  • Thaw puff pastry overnight in the refrigerator.
  • Place cheese in the freezer for 10 minutes before grating for best results.

How Do I Make Puff Pastry Bites?

Just check out the recipe card below with full ingredients and instructions. You can print the card out too (don’t worry, the pics don’t print to save your ink!).

Caramelized Onion & Mushroom Puff Pastry Bites Recipe

Puff Pastry Bites with Caramelized Onion & Mushroom

Yield: 64
Prep Time: 30 minutes
Cook Time: 1 hour 30 minutes
Total Time: 2 hours

These Puff Pastry Bites with caramelized onions and mushrooms are a savory appetizer that hits all the right flavor notes!


For the Marinated Mushrooms

  • 8 oz / 225g baby Portobello mushrooms, cleaned and sliced
  • ¼ cup Marsala wine
  • Sea salt and black pepper, to taste
  • 2 Tbsp extra virgin olive oil

For the Caramelized Onions

  • 4 large yellow onions
  • ¼ cup unsalted butter
  • 3 Tbsp dry white wine
  • Sea salt and black pepper, to taste

For the Puff Pastry Bites

  • 1 package puff pastry
  • 2 eggs, beaten
  • all-purpose flour (plain flour), for rolling
  • 8 oz / 225g Applewood smoked cheddar, grated
  • 3 Tbsp fresh thyme leaves


  1. Place the mushrooms and Marsala wine into a medium glass bowl. Season with salt and black pepper, to taste. Toss to coat.
  2. Marinate for 20 minutes at room temperature. Drain excess moisture before cooking.
  3. While the mushrooms are marinating, slice off both ends of each onion and remove the papery outer layers. Cut in half lengthwise (from tip to root) and then slice each half lengthwise into strips. Tip: Don’t slice too thin or they may burn while cooking.
  4. Melt the butter in a large, high-sided skillet or frying pan over medium heat. (For best results, do not use a non-stick pan). Add onions and stir until coated with butter.
  5. Cook for approximately 45- 50 minutes, stirring every 5 minutes or so, to ensure they cook evenly and don’t stick to the pan. The exact cooking time will vary depending on several factors, including the age of the onions and how many you cook at one time.
  6. Once the onions are started, heat 2 tablespoons olive oil in another large skillet over medium-high heat. Once the oil is hot, add marinated mushrooms and sauté until browned and tender, approximately 5-7 minutes. Remove from heat and transfer to a bowl. Set aside.
  7. Preheat oven to 190C/375F/Gas 5 and line two large, rimmed baking sheets with parchment paper or nonstick baking mats. Set aside.
  8. When the onions reach the desired depth of color, add white wine to deglaze the bottom of the pan. Add more liquid, if necessary, to scrape up all the brown bits and then salt and pepper the onions, to taste. Remove from heat and set aside.
  9. Cut thawed puff pastry dough in half and roll out on a lightly floured surface. With a sharp knife or pizza cutter, cut the puff pastry sheet into 32 equally sized rectangles. blank
  10. Transfer puff pastry pieces to a prepared baking sheet and place in the freezer for 10 minutes.
  11. Repeat the above steps for the other half of the puff pastry.
  12. Remove baking sheets from the freezer and let sit for a couple of minutes before brushing each piece with the beaten egg. Divide the grated cheddar cheese, caramelized onions, and sautéed mushrooms among the puff pastry pieces and top with the thyme.
  13. Place baking sheets in the preheated oven and bake for 10-15 minutes before rotating each baking sheet to ensure the pastry bites cook evenly.
  14. Continue cooking until the pastry is golden brown, approximately 8-10 minutes. Remove from oven and cool slightly before serving. Enjoy!
Nutrition Information:
Yield: 64 Serving Size: 1
Amount Per Serving: Calories: 42Total Fat: 3gSaturated Fat: 1gTrans Fat: 0gUnsaturated Fat: 1gCholesterol: 11mgSodium: 42mgCarbohydrates: 3gFiber: 0gSugar: 1gProtein: 1g

This site uses Nutritionix to provide estimated nutrition. Nutritional information is always approximate and will depend on the quality of ingredients used and serving sizes. If you need exact calories and macros, please do your own calculations.

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Make It A Meal!

You’ve could make these puff pastry bites bigger and serve them as an appetizer starter before a meal. But what about the rest of the courses?

Here are additional recipes to make a full meal!

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