French Onion Brie Puffs

Do you love pot pie? Then you’ll love these French Onion Brie Puffs (a.k.a en croute recipe)! A delicious sheet of puff pastry cooked to perfection, wrapped around brie cheese for an irresistible appetizer. 

What is en croute?

“En croute” is basically food baked in a pastry puff. Easy! It’s pronounced “on KROOT” and its food (usually cheese) wrapped in pastry dough and then baked in the oven. The dough can be an ordinary pie dough or puff pastry. In this recipe, golden, flaky puff pastry envelops a creamy wheel of brie that’s been stuffed with rich, jammy caramelized onions. When you cut into it, the cheese oozes out in the most mouth-watering way.

Why you’ll love this brie en croute

• Impressive to look at, easy to make! 
• It’s make-ahead friendly. Just caramelize the onions and assemble the brie en croute a day in advance, then bake it fresh when guests arrive.
• The sweet, savory onions pair perfectly with creamy, buttery brie and crisp, flaky pastry.
• This warm, indulgent appetizer feels special and cozy, making it ideal for winter entertaining.

Ingredients needed 

• Puff pastry: One sheet of thawed, store-bought puff pastry is the secret to that golden, buttery, flaky crust without the fuss of making dough from scratch.
• Brie cheese: An 8-ounce round of brie gives you that luxurious, creamy center that melts beautifully. Look for a good-quality wheel.
• Yellow onions: Two large yellow onions, sliced thin and cooked low and slow, develop a deep, sweet, jammy flavor that’s the heart of this recipe.
• Unsalted butter: Used to sauté the onions, adding richness and helping them caramelize to perfection.
• White wine, water, or broth: A splash of liquid deglazes the pan, lifting up all those delicious, browned bits from the bottom and adding extra depth of flavor.
• Egg wash: One beaten egg mixed with a tablespoon of water gives the pastry that gorgeous golden-brown shine.
• Kosher salt: A generous pinch enhances the onions’ natural sweetness and balances the richness of the cheese.
• For garnish (optional): Fresh rosemary sprigs and the reserved caramelized onions make a beautiful finishing touch.

How do you make these French onion brie puffs? 

Caramelize the onions:

1. In a large saucepan or skillet, melt the butter over medium heat.
2. Add the sliced onions and season with a generous pinch of kosher salt.
3. Cook, stirring occasionally, until the onions begin to soften, about 10 minutes.
4. Reduce the heat to medium-low and continue cooking, stirring occasionally, for another 20 minutes.
5. After 20 minutes, the onions will deepen in color. When the bottom of the pan starts to darken, add ¼ cup of white wine, broth, or water and scrape up all the browned bits.
6. Taste for additional salt and continue cooking for 20-25 more minutes, stirring more frequently, until the onions are dark, jammy, and fragrant.
7. Remove from heat and set aside.

PRO TIP: Don’t rush the onions! Low and slow is the key to true caramelization. If they start to burn, lower the heat and add a splash of liquid to keep them moist.

Prepare the brie:

1. Using a sharp knife, carefully cut the Brie round in half horizontally, like you’re splitting a burger bun.
2. Spread half of the caramelized onions onto the cut side of one cheese round.
3. Top with the other cheese round, cut side down, gently pressing them together to seal.
4. Reserve the remaining onions for garnish.

PRO TIP: Chill the brie slightly before cutting if it feels too soft. This makes it easier to slice cleanly without squishing.

Assemble the brie puffs:

1. Preheat your oven to 400°F.
2. On a lightly floured surface, roll out the thawed puff pastry sheet to about ⅛ inch thick.
3. Place the stuffed brie in the center of the pastry square.
4. Place a 10½–11 inch bowl over the brie and use a sharp paring knife to cut around the edge, creating a large circle. Remove the excess pastry.
5. Brush the pastry circle with egg wash, then gently stretch and fold the dough up and over the brie, completely enclosing it. Pinch the seams to seal.
6. Place the wrapped brie seam-side down on a parchment-lined plate and freeze for 30 minutes. This step is crucial for keeping the pastry from leaking during baking.

PRO TIP: If the pastry tears, patch it with a small piece of scrap dough and seal with a dab of egg wash – no one will ever know!

Bake and serve:

1. After chilling, transfer the brie en croute to a parchment-lined baking sheet.
2. Brush the top and sides with the remaining egg wash for a glossy finish.
3. Bake for 18-20 minutes, rotating the pan 180° halfway through, until the pastry is puffed and deeply golden brown.
4. Let it rest for 5 minutes before serving. This allows the cheese to set slightly so it doesn’t all run out when you cut into it.
5. Garnish with the reserved caramelized onions and fresh rosemary sprigs.

PRO TIP: Serve warm, not piping hot, for the best texture. The cheese will be perfectly oozy but still hold its shape.

Serving

Serve this show-stopping brie en croute on a large wooden board surrounded by your favorite crackers, salami flowers (folded in quarters), fresh apple slices, and other delicious appetizers. It’s fantastic alongside these Charcuterie Cups or as the centerpiece of a holiday appetizer spread. 

Sandy’s tips and substitutions:

• Thaw puff pastry properly: Keep the pastry in the fridge overnight to thaw, or leave it at room temperature for about 30-40 minutes. It should be cold but pliable. Too warm and it becomes sticky and hard to work with.
• Don’t skip the freezing: Chilling the assembled brie for 30 minutes ensures the butter in the pastry stays solid, which gives you those beautiful, flaky layers and prevents leaks.
• Use a quality brie: Look for a brie that’s ripe but not overly runny. A triple-cream brie will be extra luxurious.
• Make ahead: Caramelize the onions up to 3 days in advance and store in the fridge. You can also assemble the entire en croute (minus the egg wash) and freeze it for up to a month. Bake straight from frozen, adding 5-10 extra minutes.
• Storage: Leftovers keep in the fridge for up to 3 days. Reheat in a 350°F oven for 5-7 minutes to crisp the pastry back up (microwaving will make it soggy).

Variations:

• Add herbs: Stir fresh thyme, rosemary, or sage into the caramelized onions for an earthy, aromatic twist.
• Swap the cheese: Try Camembert for an even creamier, more intense flavor, or use goat cheese for a tangy contrast.
• Add fruit: Layer in a few slices of pear, apple, or a spoonful of fig jam along with the onions for a sweet-savory combination.
• Nutty crunch: Sprinkle toasted walnuts or pecans over the onions before sealing the brie for added texture.
• Spicy kick: Add a pinch of red pepper flakes or a drizzle of hot honey to the onions for a little heat.
• Mini bites: Cut the puff pastry into smaller squares and make individual brie bites – perfect for cocktail parties!

For more mouth-watering baked-brie recipes, try my Roasted Strawberry Brie, Cranberry Pistachio Brie Appetizer, Baked Brie Bread Bowl, and Baked Brie with Peach Jam. 

More puff pastry appetizers you may want to try:

• Charcuterie Puff Pastry Tart
• Puff Pastry Twists
• Grape Puff Pastry Bites

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French Onion Brie Puffs

Sandy Coughlin

Golden, flaky puff pastry wrapped around creamy brie cheese and sweet, jammy caramelized onions. These elegant yet easy French onion brie puffs are a must-make for holiday parties and cozy winter gatherings!

Prep Time: 10 minutes mins

Cook Time: 1 hour hr 5 minutes mins

freezing time: 30 minutes mins

Total Time: 1 hour hr 45 minutes mins

Yield: 8

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Ingredients

 

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• 2 large yellow onions, halved and cut into 1/4’’-1/8’’ slices
• 2 Tbsp unsalted butter
• ⅛ cup white wine, water, or broth
• Kosher salt to taste
• 1 sheet puff pastry, thawed
• 8 oz Brie round
• 1 egg, beaten with 1 Tbsp water

Instructions

 

• In a large saucepan or skillet, melt the butter over medium heat. Add the onions to the pan and season with a generous pinch of salt. Cook the onions down, stirring occasionally until they begin to soften, about 10 minutes. Reduce heat to medium-low, and continue cooking, stirring occasionally, for 20 minutes or so.
• After 20 minutes, the onions will deepen in color and require more frequent stirring. When the bottom of the pan begins to darken, add the 1/4 c of white wine, broth, or water and scrape the bottom. Taste for additional salt and continue cooking for 20-25 more minutes. When the onions are jammy–dark, and fragrant–remove from the heat and set aside.
• Using a sharp knife, cut the Brie in half. Spread half of the onions onto one of the cheese rounds and top with the other round—reserve the remaining onions for garnish. Gently press the rounds together and set aside.
• Preheat oven to 400 degrees F.
• Roll out the puff pastry on a lightly floured surface so it is about 1/8’’ thick. Place the Brie in the center of the square and place a 10 1/2’’-11’’ bowl on top. Using a sharp pairing knife, cut around the edge to form a large circle. Remove excess puff pastry and brush the pastry with egg wash, then gently stretch the dough to cover the Brie. Place on a parchment-lined plate and freeze for about 30 minutes.
• After Brie has chilled, transfer to a parchment-lined sheet and brush with the remaining egg wash. Bake the Brie for 18-20 minutes, or until puffed and golden—rotate 180 degrees halfway through baking.
• Garnish with remaining onions and rosemary. Serve hot with crackers and cured meats.

Notes

Sandy’s tips:

• Thaw puff pastry properly: Keep the pastry in the fridge overnight to thaw, or leave it at room temperature for about 30-40 minutes. It should be cold but pliable. Too warm and it becomes sticky and hard to work with.
• Don’t skip the freezing: Chilling the assembled brie for 30 minutes ensures the butter in the pastry stays solid, which gives you those beautiful, flaky layers and prevents leaks.
• Make ahead: Caramelize the onions up to 3 days in advance and store in the fridge. You can also assemble the entire en croute (minus the egg wash) and freeze it for up to a month. Bake straight from frozen, adding 5-10 extra minutes.
• Storage: Leftovers keep in the fridge for up to 3 days. Reheat in a 350°F oven for 5-7 minutes to crisp the pastry back up (microwaving will make it soggy).
  

  Variations:

  • Add herbs: Stir fresh thyme, rosemary, or sage into the caramelized onions for an earthy, aromatic twist.
  • Swap the cheese: Try Camembert for an even creamier, more intense flavor, or use goat cheese for a tangy contrast.
  • Add fruit: Layer in a few slices of pear, apple, or a spoonful of fig jam along with the onions for a sweet-savory combination.
  • Nutty crunch: Sprinkle toasted walnuts or pecans over the onions before sealing the brie for added texture.
  • Spicy kick: Add a pinch of red pepper flakes or a drizzle of hot honey to the onions for a little heat.
  • Mini bites: Cut the puff pastry into smaller squares and make individual brie bites – perfect for cocktail parties!

Cuisine: French

Course: Appetizer

Calories: 324kcal, Carbohydrates: 20g, Protein: 10g, Fat: 23g, Saturated Fat: 10g, Polyunsaturated Fat: 2g, Monounsaturated Fat: 10g, Trans Fat: 0.1g, Cholesterol: 56mg, Sodium: 270mg, Potassium: 170mg, Fiber: 1g, Sugar: 5g, Vitamin A: 286IU, Vitamin C: 4mg, Calcium: 76mg, Iron: 1mg

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