For the dough, stir the butter until it is very frothy. Add sugar, powdered sugar and vanilla sugar and keep stirring until the mixture is creamy and light, which can take a few minutes. Knead in the almonds and flour. Form 3 cm thick rolls, wrap in foil and refrigerate for at least 2 hours.
Cover the baking sheet with baking paper. Preheat the oven to 175 ° C. Cut the dough rolls into 8 mm thick slices and place on the tray. Bake for about 15 minutes.
Mix the sugar with vanilla sugar in a plate. Turn the cookies in it while they are still hot. Let cool down.