Put the softened butter, 50 g sugar, 1 egg, flour and wholemeal flour as well as the teaspoon of baking powder in a bowl and work into a dough (knead is best). Put the dough in a greased cake tin
Mix the quark, 50 g sugar, 1 egg and the vanilla sugar. Then add the blueberries to the mixture and stir in. Distribute the mixture evenly on the dough.