Mushroom and Gruyère Puff Pastry Tart with Thyme
A flaky puff pastry tart topped with sautéed mushrooms, melted Gruyère cheese, and fragrant fresh thyme for an elegant appetizer or light meal. This french-inspired vegetarian (vegetarian) ready in about 45 minutes layers sheet, thawed frozen puff pastry sheet, olive oil, sliced button mushrooms into a dessert worth slowing down for — great for weekend baking, holiday tables, or any time you want a sweet payoff at the end of a meal. Each serving lands at about 380 calories and feeds 4, so it slots into a weekend bake or a special-occasion dessert tray. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.
Ingredients
- 1 sheet, thawed frozen puff pastry sheet
- 2 tbsp olive oil
- 10 oz, sliced button mushrooms
- 1 small, finely chopped shallot
- 1 tbsp fresh thyme leaves
- 1/2 tsp salt
- 1/4 tsp black pepper
- 6 oz, grated Gruyère cheese
- 1 large, beaten for egg wash egg
Instructions
- Step 1: Preheat the oven to 400°F. Roll out 1 thawed frozen puff pastry sheet on a lightly floured surface into a 12x10 inch rectangle. Transfer to a baking sheet lined with parchment paper.
- Step 2: Using a sharp knife, score a 1-inch border around the edges of the pastry without cutting all the way through to create a raised crust. Prick the center lightly with a fork to prevent puffing.
- Step 3: Heat 2 tbsp olive oil in a large skillet over medium-high heat. Add 1 small finely chopped shallot and sauté for 2 minutes until translucent.
- Step 4: Add 10 oz sliced button mushrooms, 1 tbsp fresh thyme leaves, 1/2 tsp salt, and 1/4 tsp black pepper. Cook for 6-8 minutes, stirring occasionally, until mushrooms release their liquid and turn golden brown.
- Step 5: Spread the sautéed mushrooms evenly inside the scored border on the puff pastry. Sprinkle 6 oz grated Gruyère cheese over the mushrooms.
- Step 6: Brush the 1-inch border with 1 beaten large egg to give a golden finish.
- Step 7: Bake the tart in the preheated oven for 20-25 minutes until the pastry is puffed, golden, and the cheese is melted and bubbly. Let cool for 5 minutes before slicing and serving.
Equipment for this recipe
Top-rated tools to make this recipe successfully.
Frequently asked questions
How long does Mushroom and Gruyère Puff Pastry Tart with Thyme take to make?
Total time is about 45 minutes (15 min prep + 30 min cook). Most home bakers find this fits a weekend afternoon; chill or store as the recipe directs before serving.
How do I store leftover Mushroom and Gruyère Puff Pastry Tart with Thyme?
Cool fully before storing. Most baked desserts keep at room temperature in an airtight container for 2–3 days, or in the fridge for up to 5 days. Cream- or custard-based desserts must go in the fridge within 2 hours; reheat gently or serve cold per the recipe.
Can I substitute ingredients in Mushroom and Gruyère Puff Pastry Tart with Thyme?
Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.
How do I scale Mushroom and Gruyère Puff Pastry Tart with Thyme for a different number of people?
The recipe is written for 4 servings. Multiply each ingredient by (your serving target / 4). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.
Is Mushroom and Gruyère Puff Pastry Tart with Thyme vegetarian?
Yes — this recipe is tagged vegetarian based on its ingredient list. Always cross-check labels for packaged ingredients (sauces, broths, condiments) since formulations vary by brand.
