Mash bananas in a large bowl. Stir in dry cake mix and the applesauce.
Scoop or pipe into a donut baking sheet. This yields about 12-13 donuts.
Bake at 350F for 7-9 minutes.
Optional: melt cake frosting in a microwave safe bowl for about 30 seconds and stir until smooth. Dip or drizzle over the donuts.