Drain the cherries. Beat butter, sugar and vanilla sugar until frothy. Gradually stir in the eggs. Mix flour with baking powder, sieve and work in with the milk. Cover a springform pan with baking paper, place the dough on top and smooth it out. Spread the cherries on top.
For the topping: Mix the sour cream, eggs and sugar until smooth. Pour the topping over the cherries.
Bake in a preheated oven at 200 ° C for 40-45 minutes.
Let cool on a wire rack. Serve dusted with powdered sugar.