Mix the flour with baking powder and sieve. Add sugar, vanilla sugar, cinnamon, egg and butter. Process everything with the mixer (or with your hands) into sprinkles.
Place a good half of the crumble on a baking sheet and press down to a bottom. Spread the applesauce on the dough and sprinkle the remaining crumble on top.
Put the baking sheet in the preheated oven and bake the cake at 180 ° C for about 50 minutes.