Mix the buttermilk with the butter, eggs, sugar and vanilla sugar until frothy. Add the flour and baking powder. Stir in the children`s chocolate. Line the muffin tin with paper liners and fill halfway with batter. Press a Kinder Schokobon into the mass and pour the second half on top.
Bake for 20 - 25 minutes in a preheated oven at 160 ° C convection or 180 ° C top / bottom heat.
As a finish, you can decorate the muffins with white chocolate.