Preheat your oven to 400°F (200°C). Gather your ingredients while the oven heats.

Roll out the thawed puff pastry on a floured surface until ⅛-inch thick. Cut into squares or circles (3-4 inches) and place on a parchment-lined baking sheet. Prick pastry bases with a fork.

Heat olive oil in a skillet over medium heat. Sauté shallots for 2-3 minutes until translucent. Stir in garlic and mushrooms, cooking for 5-7 minutes. Season with salt and pepper.

Combine sautéed vegetables with softened goat cheese and chopped herbs in a mixing bowl. Stir until fully integrated.

Place a spoonful of filling in the center of each pastry, leaving a half-inch border around edges.

Bake the tarts in the preheated oven for 15-20 minutes until golden brown and puffed.

Remove from oven and let cool for a few minutes before serving.