Preheat oven to 200 degrees.
Mash the bananas with a potato masher or a fork.
Add the applesauce, peanut butter, and cinnamon and mix well.
Slowly mix in the flour, stirring constantly.
Knead into a ball of dough with your hands.
Roll out the dough and cut into shapes of your choice.
Place on a lightly greased cookie sheet.
Bake in the oven for approximately 12 minutes. (Start checking at about 8 minutes, since ovens will cook differently.)
Let the cookies thoroughly cool.
Share the cookies with your fur babies.