Thaw puff pastry for 40 minutes.
Preheat oven to 400° F.
Unfold pastry on lightly floured surface. Roll into an 18x9-inch rectangle. Cut into 18 - 3 inch squares.
Press squares into 3-inch muffin cups that have been coated with cooking spray; set aside.
In mixing bowl, stir together cheese and milk until smooth.
Spoon a rounded teaspoonful into each pastry shell. Top with pieces of bacon and green onion.
Bake for 15 minutes or until pastry is golden brown.
Servings: 18 appetizers