Mix the flour, cocoa powder, salt, sugar and vanilla sugar

Melt the butter and add to the flour mixture and process everything into crumble.

Chill the sprinkles for at least 1 hour.

Peel and core the apples and cut into pieces.

Drizzle with lemon juice.

Mix together the egg yolks, sour cream, powdered sugar and cinnamon.

Grease a 26 cm springform pan and fill in half of the chocolate sprinkles and press down to a bottom.

Spread the apple pieces on top.

Pour the creamy cream on top and spread the remaining crumble on top.

Bake the cake in a preheated oven at 160 ° for about 40 minutes.

Let cool and serve.