Mash the banana, grate the apple and mix well with the rest of the ingredients. Pour the ingredients into the muffin pan, fill the hollows a maximum of 3/4. Bake the muffins on the middle rack for about 15-20 minutes at 175 ° C.
Make a chopstick test.
The banana flavor will crystallize out a little more, if you want more apple flavor, you add half an apple.