Stir butter or margarine until foamy and gradually add sugar, vanilla sugar and eggs. Mix in the baking powder, the sifted flour and the ground hazelnuts alternately with the milk. Finally stir in the chocolate. Put a tablespoon of the batter into each of the muffin cups,
Bake in the fan for approx. 180 ° C for 20 minutes, otherwise at 200 ° C for approx. 20 minutes.
Coat the cooled tartlets with chocolate icing, place colorful faces with Smarties.