French-Inspired Roasted Mushroom and Gruyère Tart
A savory tart with a flaky pastry crust filled with caramelized mushrooms, melted Gruyère cheese, and fresh thyme, perfect for a light dinner or brunch. This french-inspired vegetarian (vegetarian) ready in about 45 minutes layers unsalted butter, finely chopped shallots, fresh thyme leaves 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 420 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 (9-inch) sheet, thawed puff pastry sheet
- 12 oz, sliced mixed mushrooms (cremini, shiitake, button)
- 2 tbsp unsalted butter
- 2, finely chopped shallots
- 1 tbsp fresh thyme leaves
- 1/2 tsp salt
- 1/4 tsp black pepper
- 1 cup shredded Gruyère cheese
- 1/4 cup heavy cream
- 1, beaten for egg wash egg
Instructions
- Step 1: Preheat oven to 400°F. Roll out 1 thawed 9-inch puff pastry sheet on a baking sheet lined with parchment paper. Score a 1-inch border around the edges without cutting through.
- Step 2: In a large skillet, melt 2 tbsp unsalted butter over medium heat. Add 2 finely chopped shallots and sauté for 2 minutes until translucent. Add 12 oz sliced mixed mushrooms, 1 tbsp fresh thyme leaves, 1/2 tsp salt, and 1/4 tsp black pepper; cook for 8-10 minutes until mushrooms release moisture and become golden brown.
- Step 3: Spread the cooked mushroom mixture evenly inside the pastry border. Sprinkle 1 cup shredded Gruyère cheese over the mushrooms. Drizzle 1/4 cup heavy cream evenly on top.
- Step 4: Brush the 1-inch pastry border with 1 beaten egg to help it brown. Bake the tart for 20-25 minutes until the crust is puffed and golden and the cheese is melted and bubbling.
- Step 5: Let the tart cool for 5 minutes before slicing. Serve warm with a side salad.
Equipment for this recipe
Top-rated tools to make this recipe successfully.
Frequently asked questions
How long does French-Inspired Roasted Mushroom and Gruyère Tart 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 French-Inspired Roasted Mushroom and Gruyère Tart?
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 French-Inspired Roasted Mushroom and Gruyère Tart?
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 French-Inspired Roasted Mushroom and Gruyère Tart 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 French-Inspired Roasted Mushroom and Gruyère Tart 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.
