Rustic Gex-Style Wild Mushroom and Gruyère Tart
A savory tart filled with sautéed wild mushrooms and melted Gruyère cheese, showcasing the rustic flavors beloved in the Ain region near Gex. This French-inspired vegetarian recipe, ready in about 45 minutes, layers puff pastry sheet, wild mushrooms, unsalted butter 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 320 calories and feeds 6, 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 (9x12 inches), thawed puff pastry sheet
- 12 oz, cleaned and sliced wild mushrooms
- 3 tbsp unsalted butter
- 2 cloves, minced garlic cloves
- 1 tsp fresh thyme leaves
- 1 cup shredded Gruyère cheese
- 1/4 cup heavy cream
- 3/4 tsp salt
- 1/2 tsp black pepper
- 1, beaten (for glazing) egg yolk
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Equipment for this recipe
Top-rated tools to make this recipe successfully.
Instructions
- Step 1: Preheat oven to 400°F (200°C). Roll out 1 sheet of thawed puff pastry onto a baking sheet lined with parchment paper.
- Step 2: In a large skillet, melt 3 tbsp unsalted butter over medium heat. Add 2 minced garlic cloves and 12 oz sliced wild mushrooms, sauté for 6-8 minutes until mushrooms are tender and fragrant.
- Step 3: Stir in 1 tsp fresh thyme leaves, 3/4 tsp salt, and 1/2 tsp black pepper. Remove from heat and let cool slightly.
- Step 4: Spread the mushroom mixture evenly over the puff pastry, leaving a 1-inch border around edges.
- Step 5: Sprinkle 1 cup shredded Gruyère cheese evenly over the mushrooms.
- Step 6: Drizzle 1/4 cup heavy cream over the cheese and fold the edges of the pastry inward to create a rustic border.
- Step 7: Brush the 1 beaten egg yolk over the exposed pastry edges for a golden finish.
- Step 8: Bake in the preheated oven for 20-25 minutes until the pastry is puffed and golden and the cheese is bubbly.
- Step 9: Let the tart cool for 5 minutes before slicing and serving warm.
Frequently asked questions
How long does Rustic Gex-Style Wild 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 Rustic Gex-Style Wild 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 Rustic Gex-Style Wild 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 Rustic Gex-Style Wild Mushroom and Gruyère Tart for a different number of people?
The recipe is written for 6 servings. Multiply each ingredient by (your serving target / 6). 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.
What goes well with Rustic Gex-Style Wild Mushroom and Gruyère Tart?
French vegetarian like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.
