Peel and quarter the apples and remove the core. Cut the apples into pieces. Mix the apple juice with the sugar, add the cinnamon to taste and the apple pieces. Let the apples cook for about 5 minutes.
For the crumble, knead the ingredients with the kneading stick of the hand mixer until crumbly.
For the batter, stir the butter, sugar and vanilla sugar until frothy. Gradually stir in the eggs. Add the sour cream. Mix the flour and baking powder and stir into the batter.
Grease a baking sheet, place the dough on it and smooth it out. Spread the apple compote evenly on the dough and sprinkle with the crumble. Bake in a preheated oven at 200 ° C for about 40 minutes. Dust the cooled cake with powdered sugar.