Ingredients

1 sheet frozen puff pastry

1 tbsp. extra-virgin olive oil

1 large shallot

1 lb. cremini mushrooms

Coarse salt

ground pepper

2 tsp. fresh thyme leaves

3/4 c. grated Gruyere cheese

Preparation

Step 1Preheat oven to 375 degrees F. Place puff pastry rounds in a single layer on a parchment-lined baking sheet and refrigerate while mushrooms cook. In a large skillet, heat oil over medium-high. Add shallot and cook, stirring, until soft, 3 minutes. Add mushrooms and cook, stirring, until soft and browned, 10 minutes. Season with salt and pepper. Stir in thyme and remove skillet from heat.Step 2Lightly oil 6 jumbo muffin cups. Divide mushroom mixture and cheese among cups, then top each with a chilled pastry round. Bake until pastry is golden brown and puffed, about 25 minutes, rotating pan halfway through.Step 3Run a small knife around cups to loosen tartlets. Place a rimmed baking sheet or large plate over pan and invert to release tartlets. Sprinkle with more thyme. Serve warm. Looking for party-ready recipes? Try our top guacamole recipes, birthday cakes, or punch recipes.