Preheat oven to 220 C (430 F) and line a baking tray with baking paper.
Lay two sheets of puff pastry on a clean, flat surface and use a brush or spatula to coat with whisked egg.
Sprinkle basil evenly over the egg.
Sprinkle Parmesan cheese evenly over the top.
Cut into squares about 2cm x 2cm
Place all the little squares onto prepared baking tray, evenly spaced.
Bake for 8-10 minutes or until puffed and golden.