For cinnamon stars, beat the egg whites until stiff and gradually stir in the icing sugar. Set aside about 80 g of the egg whites for the icing. Grind 300 g almonds, stir into the remaining beaten egg white and season with cinnamon. The quantity of almonds depends on the size of the eggs. The dough should become so firm that it can be rolled out. Grind the remaining almonds and sprinkle on the work surface. Place the dough for the cinnamon star cookies on top and press flat with lightly floured hands. Rub a rolling pin with flour and roll out the dough about 1 cm thick. Cinnamon star cookies with a moistened star shape cut out. Place the cinnamon star cookies with a knife or a pallet on a baking tray lined with baking paper. Spread the remaining beaten egg white over the cinnamon stars. Leave to dry overnight. Bake the cinnamon star cookies in the preheated oven at 160° on the middle shelf for approx. 8 minutes.