Pass the icing sugar through a fine sieve. Beat the egg whites with the whisks of the hand mixer until stiff. Add icing sugar by the spoonful and stir in. (The egg white mixture must be beaten very hard.) To coat the stars, take off 5 tablespoons of beaten egg white (approx. 130 g) and set aside.
Stir almonds, vanilla sugar, cinnamon and bitter almond flavour into the remaining egg whites. Roll out the dough on a work surface sprinkled with ground almonds to a thickness of approx. 0.5 cm. (Dip the cookie cutters in icing sugar from time to time so that the dough does not stick to the cutters). Cut out stars of different sizes and carefully place them on two baking trays lined with baking paper.
(The rest of the dough can be kneaded again and processed in the same way.) Brush the stars thickly with the beaten egg white that has been put aside. Bake the trays one after the other in a preheated oven (electric cooker: 150 °C/ convection oven: 125 °C/ gas: stage 1) for 18-20 minutes.
Remove from the oven, place on a rack and allow to cool.