Preheat the oven to 160 ° degrees circulating air. Line a 26 cm diameter springform pan with parchment paper
Knead all the ingredients for the base and press them flat on the bottom of the springform pan and pull up an edge of about 2 cm (it may seem too little dough, but it fits ;-))
Put the applesauce in a saucepan and bring to a boil. Stir the vanilla pudding powder with a little milk or apple juice until smooth and add to the applesauce and bring to the boil again briefly. Now put the warm applesauce on the base.
Now mix the ingredients from the crumble and pour them evenly onto the applesauce.
Bake the cake for 45-50 minutes.