Combine the butter and sugar well, stir with the egg yolks until creamy, stir in the remaining ingredients (flour, starch, baking powder, eggnog and Nutella) - spread the dough on a prepared, smaller 30 tray
Covering:
Beat the egg white firmly - stir the butter with icing sugar until creamy, stir in the remaining ingredients and finally fold in the egg whites - spread the mixture on the dough.
I.
Bake in the preheated oven at 160 ° convection for approx. 25-30 minutes (stick test) - when cold, sprinkle with chocolate glaze.