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Baked Brie en Croûte with Caramelized Onion on platter with apple slices

Puff Pastry Wrapped Baked Brie with Caramelized Onions

This Baked Brie, topped with balsamic caramelized onions and wrapped in a puff pastry crust, is a rich and elegant appetizer.
Course Appetizer
Cuisine French
Prep Time 15 mins
Cook Time 1 hr
Total Time 1 hr 15 mins
Servings 12 servings
Calories 273


  • 4 tablespoons butter
  • 2 medium yellow onions (sliced thin)
  • 1 teaspoon kosher salt
  • ½ teaspoon pepper (freshly ground)
  • 1 teaspoon granulated sugar
  • 2 tablespoons balsamic vinegar
  • 1 teaspoon fresh thyme
  • 13.4 ounce brie wheel (size can vary but this is what I found at Costco)
  • 9 ounce puff pastry (I used one sheet from a Trader Joe's Puff Pastry package)
  • 1 egg (slightly beaten)


  • Melt butter in large sauté pan over medium high heat. Add onion slices with salt and pepper, toss to coat in melted butter, and then stir occasionally only to prevent burning.
    sliced onions in pan
  • Cook until the onions turn a deep golden brown and have caramelized. This can take 15-25 minutes. Once caramelized, add the sugar and balsamic vinegar.
    adding balsamic vinegar to sautéed onions
  • Stir to combine and cook for several more minutes until all of the moisture has evaporated. Set aside and allow to cool.
    balsamic caramelized onions
  • Unfold puff pastry sheet and set out on large cutting board. Roll the puff pastry to a large enough square so that it can fully wrap around the brie, onions, and fresh thyme. Set the brie wheel on the center of the puff pastry and top with the caramelized onions.
    brie wheel topped with caramelized onions
  • Pull the corners up on the puff pastry so that they meet in the middle and crimp together to form a tight seal. If there are any openings, the brie will spill out when you bake it.
    brie wheel wrapped in puff pastry
  • Use a pastry brush to cover the puff pastry. This will give you a rich golden brown color as it cooks. You need not use all of the egg.
    egg wash on puff pastry
  • Carefully transfer the covered brie to a baking sheet lined with parchment paper or a silicon mat. Bake in a preheated 400° F oven for 30-40 minutes or until it is golden brown. Serve warm with sliced apples.


Calories: 273kcal | Carbohydrates: 12g | Protein: 9g | Fat: 21g | Saturated Fat: 10g | Cholesterol: 55mg | Sodium: 486mg | Potassium: 96mg | Fiber: 1g | Sugar: 2g | Vitamin A: 332IU | Vitamin C: 2mg | Calcium: 68mg | Iron: 1mg