Savory Mini Mushroom Tartelettes with Thyme and Gruyere

Published: May 21, 2026
Marie PowellMarie Powell
Tags: French, Vegetarian, Appetizer, Party Food, Mushroom

Mushroom Tartelettes

Elegant puff pastry bites filled with earthy sautéed mushrooms and melted Gruyere cheese. Perfect for entertaining.

Prep Time:20 minCook Time:15 minTotal Time:35 minServings:12Difficulty:Medium

Nutrition (per serving)

Calories:185 kcal
Protein:4 g
Carbs:13 g
Fat:14 g

These mini mushroom tartelettes are the ultimate sophisticated appetizer for any gathering, from holiday parties to casual wine nights. The combination of buttery, flaky puff pastry with deeply caramelized cremini mushrooms and nutty Gruyere cheese creates a flavor profile that is both earthy and decadent. I love how the fresh thyme adds a bright, woody note that lifts the entire dish, making these little bites disappear almost as soon as they hit the table.

The beauty of this recipe lies in its simplicity and preparation flexibility. You can sauté the mushroom filling a day in advance and simply assemble and bake when your guests arrive. If you want to get creative, feel free to experiment with different mushroom varieties like shiitake or oyster mushrooms for a more complex forest floor flavor. Just make sure to cook the mushrooms until all their liquid has evaporated to ensure your pastry stays crisp and perfectly golden.

Ingredients

  • Frozen puff pastry sheet (thawed):1 piece
  • Cremini mushrooms (finely chopped):8 oz
  • Unsalted butter:2 tbsp
  • Shallot (minced):1 piece
  • Garlic (minced):2 cloves
  • Fresh thyme leaves:1 tsp
  • Heavy cream:1/4 cup
  • Gruyere cheese (shredded):1/2 cup
  • Egg (beaten for wash):1 piece
  • Salt and black pepper:1 to taste

Instructions

  1. Preheat your oven to 400°F and lightly grease a 12-cup mini muffin tin with cooking spray.

    Mini muffin tin lightly greased and ready for mushroom tartelettes.
  2. Melt the butter in a large skillet over medium-high heat. Add the chopped mushrooms and shallots, cooking for 8 to 10 minutes until the mushrooms have released their moisture and turned deep golden brown.

    Chopped mushrooms and shallots cooking in butter until deep golden brown.
  3. Stir in the minced garlic and fresh thyme, cooking for just 1 minute until fragrant.

    Minced garlic and fresh thyme stirred into the browned mushroom mixture.
  4. Pour in the heavy cream and cook for another 2 minutes until the liquid has mostly reduced and thickened. Season with salt and pepper, then remove from heat to cool slightly.

    Creamy mushroom filling reduced in the skillet until thick and glossy.
  5. On a lightly floured surface, roll out the puff pastry sheet. Use a 2.5-inch round cookie cutter to cut out 12 circles.

    Puff pastry rolled out and cut into small circles for tartlette shells.
  6. Gently press each pastry circle into the prepared muffin tin cups, making sure they go up the sides.

    Raw puff pastry circles pressed into mini muffin tin cups.
  7. Place a small pinch of shredded Gruyere into the bottom of each pastry cup, then top with a generous spoonful of the mushroom mixture.

    Gruyere and creamy mushroom filling spooned into the pastry cups.
  8. Lightly brush the exposed edges of the pastry with the beaten egg wash.

    Filled mushroom tartelettes brushed with egg wash around the pastry edges.
  9. Bake for 12 to 15 minutes, or until the pastry is puffed and beautifully golden brown. Serve warm.

    Baked mini mushroom Gruyere tartelettes puffed and golden brown.

Tips & Notes

  • For an extra layer of flavor, add a tiny splash of dry sherry or balsamic vinegar to the mushrooms while they sauté.
  • Ensure the mushroom mixture is relatively dry before adding it to the pastry to prevent the bottom from getting soggy.
  • You can use a glass or a jar lid if you don't have a circular cookie cutter of the right size.