Mash the bananas with a fork until they are mushy. Stir in the applesauce, peanut butter and oatmeal.
If you want, you can now add some protein powder in a suitable flavor. I used a measuring spoon of Cookies and Cream, but I can also imagine chocolate, vanilla or nuts. If you want it a little less healthy but sweeter, you can stir in a handful of chocolate.
Now place dough blobs with a tablespoon on a baking sheet lined with baking paper and bake in the oven preheated to 175 ° C for about 25 minutes. Let cool on the baking sheet and ideally eat it while it is still lukewarm!