This is all you need:
1 pk.puff pastry,
2 cups shredded mixed cheddar and mozzarella cheese,
Preheat oven at 400 F; in a small bowl beat egg with one tablespoon water; brush each square with egg mixture and sprinkle with cheese.
Cut each square in 4 pieces; place them in a ungreased baking sheet 1 inch apart. Bake for 10 to 12 minutes or until nice and golden...
and here they are...