In a large skillet, melt butter over medium-high heat. Add mushrooms, onion, garlic powder, thyme, salt, and pepper. Cook and stir for 5 minutes or until vegetables are tender.
Stir in flour. Gradually stir in chicken broth, wine, and cream. Bring to a boil. Reduce heat; simmer for 10 minutes, stirring occasionally. Stir in nutmeg and Brie.
Cut each sheet of phyllo dough into 12 (3-inch) squares. Place 1 phyllo square in the center of the greased baking sheet. Brush with melted butter. Top with a second phyllo square; brush with melted butter. Repeat with remaining phyllo squares.
Spoon about 2 tablespoons of mushroom mixture onto each phyllo square. Sprinkle Parmesan cheese over mushroom mixture. Fold corners of each phyllo square up over filling, pressing lightly to seal. Brush with remaining melted butter.
Bake for 12-15 minutes or until golden brown. Serve warm.
Interesting Facts
Phyllo dough is a paper-thin pastry dough composed of layers of filo pastry.
Brie cheese is a soft, creamy cheese with a mild, buttery flavor.
These puffs can be served warm or cold and make an excellent appetizer or snack.