Separate eggs. Knead the flour, salt, butter in pieces, egg yolk and cream into a smooth dough and refrigerate overnight.
Quarter the dough and knead lightly. Roll out the dough to a thickness of approx. 2mm, cut out stars, place on a baking sheet lined with baking paper.
Beat the egg white until stiff, gradually pouring in the sugar. Mix the hazelnuts, cocoa and spices and fold in carefully. Pour the mixture into a piping bag with a perforated nozzle and squirt a swab onto the stars. Bake the biscuits at 180 ° for about 18 minutes.