Stir the butter until creamy, then add sugar and vanilla sugar. Then add the eggs and stir vigorously.
Now slowly fold in the flour and baking powder. Put the milk and half of the dough in a greased dish dusted with flour.
Color the rest of the dough dark with the chocolate pudding powder and then also put it in the mold. Mix everything lightly with a fork (so that there is a nice pattern) and then bake the cake at 180 ° C for about 50 minutes.