Separate the egg. Mix marzipan, icing sugar, cinnamon, bitter almond flavour and egg white with the whisk of the hand mixer to a creamy mixture. Knead in the flour. Pour into a piping bag with a medium perforated spout. Line 2 baking trays with baking paper. Sharpen croissants of about 4 cm length with a large distance between them.
Whisk egg yolk and milk. Brush the croissants with it and sprinkle with almond flakes. Bake the croissants in a preheated oven (electric range: 175 °C/ convection oven: 150 °C/ gas: level 2) for 12-15 minutes. Let them cool down on cake racks. Chop the chocolate coating and melt over a hot water bath. Dip the ends of the croissants into the chocolate, allow the chocolate coating to set
1 hour waiting time