Preheat the oven to 180°C.
Line a baking tray with baking paper.
Mix together your cinnamon and sugar, then scatter this mixture onto a flat plate or chopping board.
Roll out the puff pastry and using a cookie cutter press out stars - I used 3 different sizes.
Using a silicon brush, wet the top of the stars with the beaten egg, then dip them into the cinnamon sugar.
Place them on the lined baking tray and bake for approx. 10-15 minutes (in the middle of the oven) until golden.
Let them cool in the tray before transferring them onto a serving plate.