Mushroom, Onion, and Gruyère Tart

• 1 sheet store-bought puff pastry, thawed
• 1 tablespoon olive oil
• 1 medium onion, thinly sliced
• 8 ounces mushrooms, sliced
• 2 cloves garlic, minced
• 1 teaspoon fresh thyme leaves
• Salt and pepper, to taste
• 1 cup shredded Gruyère cheese
• 1 large egg, beaten (for egg wash)
• 1 tablespoon milk

Steps

1. 1 Preheat oven to 400°F.
2. 2 On a floured surface, roll out the puff pastry into a 12-inch circle. Transfer to a parchment-lined baking sheet.
3. 3 In a large skillet, heat olive oil over medium heat. Add onions and cook until softened and golden.
4. 4 Add mushrooms, garlic, and thyme. Season with salt and pepper. Cook until mushrooms release their moisture and brown.
5. 5 Spread the mushroom and onion mixture over the pastry, leaving a 1-inch border around the edge.
6. 6 Sprinkle Gruyère cheese evenly over the filling.
7. 7 Fold the pastry edges up and over the filling to create a border.
8. 8 Whisk egg with milk and brush over the pastry edges.
9. 9 Bake for 25-30 minutes, or until pastry is puffed and golden.
10. 10 Cool slightly before slicing and serving.

Equipment

• Baking sheet
• Parchment paper
• Skillet
• Pastry brush

Variations

• Add a handful of fresh spinach or arugula to the filling for a pop of green.
• Substitute Swiss cheese for Gruyère if unavailable.

Substitutions

• Use olive oil instead of butter for a dairy-free option.
• Substitute another nutty cheese like Comté if Gruyère is not available.

Pairings

• A crisp apple slaw.
• Warm crusty bread.

Nutrition

Tips

• For extra flavor, caramelize the onions slowly over low heat.
• If you prefer a crispier crust, pre-bake the pastry for 10 minutes before adding the filling.

Storage

Store in an airtight container at room temperature for up to 2 days. Reheat in a 350°F oven until warmed through.

Freezing: Freezes well for up to 1 month. Thaw overnight in the refrigerator and reheat in a 350°F oven until warmed through.

Serving Suggestions

• Serve with a simple green salad.
• Pair with a glass of Chardonnay for a delightful lunch.

FAQ