For the vanilla crescents, toast grated hazelnuts a little. Knead flour with butter, add hazelnuts and powdered sugar and knead well again. Let the dough rest in plastic wrap for about 3 hours.
Preheat the oven to 170 degrees Celsius. Shape the dough into croissants, place on a baking tray lined with baking paper and bake for approx. 10 minutes.
Roll in a mixture of powdered sugar and vanilla sugar while still hot.