Golden Caramelized Onion & Gruyère Puff Pastry Tart
Indulge in the delightful Golden Caramelized Onion & Gruyère Puff Pastry Tart, a perfect blend of sweet caramelized onions and rich Gruyère cheese nestled in a flaky puff pastry. This elegant appetizer is not only visually stunning but also incredibly easy to prepare, making it an ideal choice for brunches, gatherings, or as a comforting snack. The tart’s golden hue and crispy texture will impress your guests, while its customizable nature allows you to experiment with different cheeses or herbs to suit your taste. Serve warm or at room temperature, and watch it disappear from the table in no time!
- Prep Time: 15 minutes
- Cook Time: 45 minutes
- Total Time: 1 hour
- Yield: Serves 8
- Category: Appetizer
- Method: Baking
- Cuisine: French
Ingredients
Scale
- 1 sheet puff pastry (thawed)
- 3 large yellow onions (thinly sliced)
- 2 tbsp butter
- 1 tbsp olive oil
- 1 cup shredded Gruyère cheese
- ¼ cup heavy cream
- 1 egg (for brushing and filling)
- Fresh thyme leaves
Instructions
- In a large skillet, melt butter and olive oil over medium heat. Add sliced onions, sugar, and salt; cook slowly for 25–30 minutes until golden brown.
- Preheat oven to 400°F (200°C). Roll out the puff pastry on a parchment-lined baking sheet, scoring a border around the edges.
- Brush edges with beaten egg and bake for 10 minutes until lightly golden.
- In a mixing bowl, whisk together heavy cream, egg, pepper, and Gruyère cheese.
- Spread Dijon mustard (optional) on the baked pastry base; pour in the cheese mixture and top with caramelized onions.
- Bake for an additional 15–18 minutes until puffed and golden brown.
Nutrition
- Serving Size: 1 slice (95g)
- Calories: 290
- Sugar: 4g
- Sodium: 300mg
- Fat: 20g
- Saturated Fat: 10g
- Unsaturated Fat: 8g
- Trans Fat: 0g
- Carbohydrates: 24g
- Fiber: 2g
- Protein: 7g
- Cholesterol: 70mg