For the base, process the first 8 ingredients into a dough and then place in a round springform pan. Bake at 150 degrees for about 15-20 minutes. Let the base cool in the springform pan.
Use a mixer to beat the ingredients for the topping to a stiff pulp. If the porridge is too thick, add a little lemonade, if the porridge is too thin, add a little more banana protein powder. Now distribute everything on the floor. If you want, you can also bake two bases and use one as a lid.
Sprinkle sweetness or cinnamon as powdered sugar for decoration. Or decorate as you wish. Put the cake in a cool place.