Preheat the oven to 200 ° C top and bottom heat. Grease a cake tin of your choice, sprinkle with flour or oat flakes.
Mash the bananas, grate or chop the apple. Both together should add up to about 400 g. Then mix all the ingredients together. Pour the dough into the mold and bake for about 40 minutes.
If necessary, sprinkle with powdered sugar after cooling.
If you don`t want the cake vegan, replace 100 ml of oil with 100 g of butter.