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Caramelized Onion Puff Pastry Bites with Gruyere and Mushrooms

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Flaky puff pastry squares filled with caramelized onions, sautéed mushrooms, and melted gruyere cheese for an elegant and flavorful appetizer.

Ingredients

4 Tbsp salted butter, divided

2 Tbsp vegetable oil, divided

5–6 oz crimini or button mushrooms, sliced

2 medium yellow onions, thinly sliced

1/4 tsp dried thyme

1 Tbsp sugar

1 1/2 Tbsp balsamic vinegar

1/4 tsp garlic powder

Salt and pepper, to taste

4 oz grated gruyere cheese (smoked if desired)

1 package (1 lb) frozen puff pastry, thawed

1 egg, lightly beaten

Instructions

  1. Melt 2 Tbsp butter with 1 Tbsp oil in a skillet over medium heat. Add onions, thyme, sugar, salt, and pepper. Cook 20–25 minutes, stirring, until golden and caramelized.
  2. Stir in balsamic vinegar and cook 2 more minutes. Remove onions and set aside.
  3. Melt remaining butter with remaining oil in skillet. Sauté mushrooms with garlic powder, salt, and pepper until browned and tender.
  4. Preheat oven to 400°F (200°C) and line a baking sheet with parchment paper.
  5. Roll puff pastry on a floured surface and cut into 2-inch squares.
  6. Place squares on baking sheet. Top each with caramelized onions, mushrooms, and grated gruyere.
  7. Fold pastry corners slightly inward, brush edges with egg wash, and bake 15–18 minutes until puffed and golden.
  8. Serve warm.

Notes

Swap gruyere for brie or fontina for creamier flavor.

Add fresh herbs like rosemary or parsley for freshness.

Mix fig jam into onions for a sweet twist.

Freeze unbaked bites and bake directly from frozen.

Drain excess liquid from filling to prevent soggy pastry.

Nutrition

Find it online: https://justsosavory.com/caramelized-onion-puff-pastry-bites-with-gruyere-and-mushrooms/