Dessert

Mushroom Tart Recipe

Name: Mushroom Tart Recipe
Prep time: 15 min
Cook time: 25 min
Total time: 40 min
Cuisine: French
Ingredients: 1 sheet puff pastry (thawed); 2 tablespoons olive oil; 1 large onion (thinly sliced); 3 cloves garlic (minced); 1 pound mixed mushrooms (sliced); 1 1/2 teaspoons dried thyme; 1/2 teaspoon salt; 1/4 teaspoon black pepper; 1 cup Gruyère cheese (shredded); 1 egg (beaten, for egg wash)

ByElena Hart October 7, 2026October 7, 2026

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Introduction

This mushroom tart is a delicious and elegant dish perfect for any occasion. With a buttery puff pastry base topped with a savory mix of mushrooms, onions, and Gruyère cheese, it’s sure to impress your guests or make a cozy meal.

The image shows a rectangular mushroom tart cut into six square pieces, placed on a white parchment-lined tray. The tart has a thick, golden-brown puff pastry crust as the bottom and edges, with a slightly flaky texture. On top, there is one main layer of sautéed mixed mushrooms in various brown shades, cooked onions in translucent white pieces, and a sprinkle of melted, slightly browned cheese that looks creamy and stringy. There are small green herb leaves scattered over the top for a fresh touch. A utensil is sliding under one piece, lifting it slightly. The scene is set on a white marbled texture surface with some herbs scattered around. Photo taken with an iphone --ar 4:5 --v 7

Ingredients

1 sheet puff pastry (thawed)
2 tablespoons olive oil

1 large onion (thinly sliced)
3 cloves garlic (minced)

1 pound mixed mushrooms (sliced)
1 1/2 teaspoons dried thyme

1/2 teaspoon salt
1/4 teaspoon black pepper
1 cup Gruyère cheese (shredded)

1 egg (beaten, for egg wash)

Instructions

Step 1: Preheat your oven to 400°F (200°C).
Step 2: On a lightly floured surface, roll out the thawed puff pastry to fit a tart pan. Place the pastry in the pan, trim the edges, and prick the bottom with a fork to prevent bubbling.

Step 3: Heat olive oil in a skillet over medium heat. Add the sliced onions and minced garlic, cooking until softened and fragrant.
Step 4: Add the sliced mushrooms, dried thyme, salt, and black pepper to the skillet. Cook until the mushrooms are soft and browned, stirring occasionally. Taste and adjust seasoning if needed.
Step 5: Spread the cooked mushroom mixture evenly over the prepared pastry crust. Sprinkle shredded Gruyère cheese on top.

Step 6: Brush the edges of the pastry with the beaten egg to help achieve a golden crust.
Step 7: Bake the tart in the preheated oven for 20-25 minutes, or until the pastry is puffed and golden brown.
Step 8: Remove from the oven and allow the tart to cool slightly before slicing. Serve warm for the best flavor.

Tips & Variations

Use a combination of mushrooms like cremini, shiitake, and oyster for deeper flavor.
For a richer taste, add a splash of white wine when sautéing the mushrooms.
Substitute Gruyère with Fontina or mozzarella if desired.

Sprinkle fresh herbs such as parsley or chives on top just before serving for a fresh finish.

Storage

Store leftover tart in an airtight container in the refrigerator for up to 2 days. Reheat gently in the oven at 350°F (175°C) for 10-15 minutes to preserve the crispiness of the pastry. Avoid microwaving if possible to prevent sogginess.

How to Serve

A close-up view of a rectangular slice of pizza held by a woman's hand on a metal spatula shows a thick, light golden crust at the base, topped with a generous layer of brown, cooked mushrooms mixed with caramelized light brown onions. Melted pale yellow cheese is spread unevenly over the mushroom mixture, with small patches visible among the toppings. The pizza appears soft and juicy, with herbs sprinkled lightly over the top. In the background, more slices of the same pizza are on a white marbled surface, slightly out of focus. Photo taken with an iphone --ar 4:5 --v 7

Serve this delicious recipe with your favorite sides.

FAQs

Can I make this tart ahead of time?

Yes, you can prepare the mushroom mixture a day in advance and store it chilled. Assemble and bake the tart just before serving for the freshest results.