Mix the flour with cornstarch and baking powder, sift into a mixing bowl. Add sugar, vanilla sugar, orange peel, egg and butter. Work through the ingredients with the hand mixer with dough hook first briefly on the lowest, then on the highest level. Cut the chocolate into small pieces, knead briefly on medium speed, then knead everything on the work surface to form a smooth dough.
Shape the dough 3 into 3 cm thick rolls, press them wide so that the strips of dough are about 5 cm wide and a good 1 cm high, and refrigerate until the dough has hardened.
Cut the dough strips with a sharp knife into almost 1/2 cm thick slices, place them on a baking sheet and bake in the preheated oven at 180 ° C (top / bottom heat) for about 10 minutes.