Mix the butter or margarine with the sugar until frothy. Add the vanilla sugar and beat in with the egg. Stir in the flour mixed with baking powder and salt, work in the chopped hazelnuts and chocolate droplets.
Place small heaps with a teaspoon on an ungreased baking sheet. Bake in the preheated oven at 175 degrees (gas: level 2) for 12-14 minutes, until they have risen and are golden brown.
After cooling for a short time, remove from the tray with a spatula. Store in a tin can.