Caramelized Onion Puff Pastry Bites with Gruyere and Mushrooms
These Caramelized Onion Puff Pastry Bites with Gruyere and Mushrooms are flaky, buttery, and loaded with caramelized onions, sautéed mushrooms, and smoky Gruyere cheese – the perfect party appetizer or savory snack.
Equipment
- 1 Mixing bowl Large
Ingredients
Main Ingredients
- 4 tablespoons Salted butter divided
- 2 tablespoons Vegetable oil divided
- 6 ounces Crimini or button mushrooms sliced
- 2 Yellow onions medium, thinly sliced
- ¼ teaspoon Dried thyme
- 1 tablespoon Sugar
- 1.5 tablespoons Balsamic vinegar
- ¼ teaspoon Garlic powder
- Salt and pepper to taste
- 4 ounces Gruyere cheese grated, applewood smoked recommended
- 1 pound Puff pastry thawed
- 1 Egg lightly beaten
Instructions
Instructions
- Preheat oven to 400°F (200°C) and line baking sheet with parchment paper.
- In a large skillet, heat 2 tablespoon butter and 1 tablespoon vegetable oil over medium heat. Add onions, sugar, and salt. Cook for 15–20 minutes until golden and caramelized.
- Add balsamic vinegar, cook 1–2 minutes, then remove onions from heat and set aside.
- Add remaining butter and oil to skillet. Add mushrooms, thyme, garlic powder, salt, and pepper. Sauté for 8–10 minutes then remove from heat.
- Roll out puff pastry on floured surface. Cut into desired shapes and place on prepared sheet.
- Spoon caramelized onion and mushroom mixture onto each pastry piece.
- Sprinkle grated Gruyere on top.
- Brush puff pastry edges with beaten egg and prick center with fork.
- Bake for 15–20 minutes until golden and puffy. Let cool slightly before serving.
Notes
Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat in oven or toaster oven for best texture. Freeze before or after baking for extended storage.