These irresistible mushroom puffs combine flaky golden puff pastry with a savory mushroom and cheese filling that disappears in minutes at every party. With just 5 simple ingredients and in less than an hour from start to finish, you'll have an impressive crowd-pleasing appetizer that looks like it came from a fancy bakery but couldn't be easier to make.
Thaw pastry sheets and lay them on a large cutting board.
Preheat oven to 400℉ and grease a standard muffin pan. (24-cup muffin pan or 2 of the 12-cup muffin pans.)
Preheat a large cooking pan over medium-high heat and add some oil.
Dice onion, mushrooms, and mince the garlic. Grate the cheese on a large side of the box grater and add it to a mixing bowl.
Add diced mushrooms to the pan and sauté until golden brown. Make a little well in the center and add garlic. Sauté until garlic is fragrant, just a few seconds.
Add diced mushrooms to the pan and mix well. Sauté over medium heat until done softened. Season with some salt and pepper and mix well. Finish sautéing until all liquid is cooked off. Take of heat.
Let mushrooms cool a little bit and then mix it with grated white cheddar cheese. Make sure to mix well. Set aside
Roll puff pastry a little bit (just a little) and cut the sheets into 9 equal squares each.
Place each square into the muffin cup, forming a little cup out of the pastry square.
Fill each pastry square with about 2 - 2½ tablespoons of mushroom cheese mixture.
Bake for 15-17 minutes, until pastry is golden-brown.