Mushroom Puff Appetizer Tart - Puff Pastry Finger Food Bites For Party Appetizers - 34 easy snacks for a party cheap simple appetizer recipes and shareable snacks for party events. This mushroom tart is an amazing quick snack and perfect for entertaining. It‘s quick to make and packed with flavor. It‘s made with puff pastry, sautéed mushrooms seasoned with garlic, balsamic, and thyme, sweet shallots, and flavorful Gruyere cheese.