A flaky puff pastry tart topped with savory sautéed mushrooms and rich Gruyère cheese creates a simple yet sophisticated appetizer. Inspired by steakhouse-style starters, this tart combines buttery pastry with earthy mushrooms and nutty melted cheese for a dish that feels elegant while remaining easy to prepare at home.
Why You’ll Love This Recipe
This mushroom and Gruyère tart delivers restaurant-quality flavor with minimal effort. The buttery puff pastry forms a crisp, golden base that pairs beautifully with tender mushrooms and creamy melted cheese.
It’s a versatile recipe that works well for many occasions, whether you’re hosting guests, preparing a holiday appetizer, or simply making a light meal. The ingredients are straightforward, yet the final result looks impressive and tastes rich and comforting.
The combination of mushrooms sautéed in butter and olive oil enhances their natural umami flavor, while Gruyère cheese adds a slightly nutty and creamy finish. Best of all, it comes together quickly using store-bought puff pastry.
Ingredients
(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)
1 sheet puff pastry, thawed
2 tablespoons olive oil
2 tablespoons butter
8 ounces cremini or button mushrooms, thinly sliced
1 small shallot, finely chopped
2 cloves garlic, minced
1 teaspoon fresh thyme leaves (or ½ teaspoon dried thyme)
½ teaspoon salt
¼ teaspoon black pepper
¾ cup shredded Gruyère cheese
2 tablespoons grated Parmesan cheese
1 tablespoon heavy cream
1 teaspoon Dijon mustard
1 egg, beaten (for egg wash)
1 tablespoon chopped fresh parsley for garnish
Directions
Preheat the oven to 400°F (200°C). Line a baking sheet with parchment paper.
Lightly flour your work surface and roll out the puff pastry slightly to smooth the seams. Place it on the prepared baking sheet.
Using a knife, score a border about ½ inch from the edges without cutting all the way through. This helps the edges puff while the center stays flat.
In a large skillet over medium heat, heat the olive oil and butter together.
Add the sliced mushrooms and cook for about 6–8 minutes, stirring occasionally, until the mushrooms release their moisture and begin to brown.
Add the chopped shallot and cook for 2 minutes until softened.
Stir in the minced garlic, thyme, salt, and black pepper. Cook for another 1 minute until fragrant.
Remove the skillet from heat and let the mixture cool slightly.
In a small bowl, mix the Dijon mustard with the heavy cream. Spread this mixture evenly over the center of the puff pastry, staying inside the scored border.
Sprinkle half of the Gruyère cheese over the mustard layer.
Evenly distribute the sautéed mushroom mixture over the cheese.
Top with the remaining Gruyère and sprinkle the Parmesan cheese on top.
Brush the pastry edges with the beaten egg.
Bake for 18–22 minutes, or until the pastry is golden brown and the cheese is melted and bubbly.
Remove from the oven, let cool for a few minutes, then garnish with chopped parsley before slicing.
Caramelized Onion Version
Add one thinly sliced onion and cook it slowly with the mushrooms until deeply golden for extra sweetness and flavor.
Herb Upgrade
Use a mix of fresh herbs such as thyme, parsley, and chives to create a more aromatic topping.
Extra Creamy Tart
Add a few spoonfuls of ricotta or cream cheese beneath the mushrooms for a richer filling.
Mixed Mushroom Tart
Combine cremini, shiitake, and oyster mushrooms for deeper mushroom flavor and texture.
Garlic Lovers Version
Increase the garlic to three or four cloves for a stronger savory profile.
Storage/Reheating
Refrigeration
Store leftover tart in an airtight container in the refrigerator for up to 3 days.
Freezing
The tart can be frozen after baking. Wrap slices tightly and freeze for up to 1 month.
Reheating in Oven
Place the tart in a 350°F (175°C) oven for about 8–10 minutes until warmed through and crisp again.
Reheating in Air Fryer
Heat at 350°F for 4–5 minutes for a crispy crust.
Avoid microwaving if possible, as it may soften the pastry.
FAQs
Can I use a different cheese instead of Gruyère?
Yes, Swiss cheese, Emmental, or mozzarella can be used. However, Gruyère provides the classic nutty flavor that works especially well with mushrooms.
Do I need to cook the mushrooms first?
Yes. Cooking the mushrooms removes excess moisture and concentrates their flavor, preventing the tart from becoming soggy.
Can I make the tart ahead of time?
Yes. You can prepare the mushroom mixture in advance and refrigerate it. Assemble and bake the tart just before serving.
How do I keep the puff pastry from becoming soggy?
Make sure the mushrooms are fully cooked and most of their moisture has evaporated before placing them on the pastry.
Can I use frozen puff pastry?
Yes. Simply thaw it according to the package instructions before using.
What mushrooms work best for this tart?
Cremini and button mushrooms are excellent choices, but shiitake or oyster mushrooms also add great flavor.
Can this tart be served as a main dish?
Yes. Pair it with a fresh green salad or roasted vegetables to turn it into a light meal.
How do I get a golden crust?
Brushing the edges of the pastry with beaten egg helps create a beautiful golden color during baking.
Can I add vegetables to the tart?
Yes. Spinach, caramelized onions, or roasted peppers can be added for extra flavor and texture.
What is the best way to slice the tart?
Allow the tart to cool for about 5 minutes after baking, then slice with a sharp knife or pizza cutter for clean portions.
Conclusion
This mushroom and Gruyère tart is a perfect balance of flaky pastry, savory mushrooms, and rich melted cheese. It’s an elegant yet simple dish that works beautifully as an appetizer, brunch option, or light dinner. With its crisp crust and flavorful filling, this tart delivers steakhouse-style sophistication while remaining easy enough to prepare in your own kitchen.
Ruth’s Chris Mushroom & Gruyère Tart is a sophisticated appetizer featuring flaky puff pastry topped with sautéed mushrooms, shallots, and rich Gruyère cheese. Quick to prepare, it delivers steakhouse-style elegance in a simple homemade tart.
Ingredients
1 sheet puff pastry, thawed
2 tablespoons olive oil
2 tablespoons butter
8 ounces cremini or button mushrooms, thinly sliced
1 small shallot, finely chopped
2 cloves garlic, minced
1 teaspoon fresh thyme leaves (or ½ teaspoon dried thyme)
½ teaspoon salt
¼ teaspoon black pepper
¾ cup shredded Gruyère cheese
2 tablespoons grated Parmesan cheese
1 tablespoon heavy cream
1 teaspoon Dijon mustard
1 egg, beaten (for egg wash)
1 tablespoon chopped fresh parsley for garnish
Instructions
Preheat oven to 400°F (200°C) and line a baking sheet with parchment paper.
Roll out puff pastry slightly on a floured surface. Place on prepared baking sheet and score a ½-inch border around edges.
In a skillet over medium heat, heat olive oil and butter. Add mushrooms and cook 6–8 minutes until moisture evaporates and they begin to brown.
Add shallot and cook 2 minutes. Stir in garlic, thyme, salt, and pepper; cook 1 minute. Remove from heat and let cool slightly.
Mix Dijon mustard and heavy cream; spread over the center of puff pastry inside the scored border.
Sprinkle half of Gruyère over mustard layer, then layer mushrooms evenly. Top with remaining Gruyère and Parmesan cheese.
Brush pastry edges with beaten egg.
Bake 18–22 minutes until pastry is golden and cheese is melted.
Cool a few minutes, garnish with parsley, and slice into 6 portions.
Notes
Caramelized Onion Version: Add thinly sliced onion and cook slowly with mushrooms for extra sweetness.
Herb Upgrade: Mix fresh herbs like parsley and chives with thyme for aromatic flavor.
Extra Creamy: Add ricotta or cream cheese under mushrooms for richer filling.
Mixed Mushrooms: Combine cremini, shiitake, and oyster mushrooms for deeper flavor.
Garlic Lovers: Increase garlic cloves to enhance savory aroma.
