Preheat oven to 350 degrees.

In a medium bowl, mash bananas with a fork.

Blend or stir the egg and melted coconut oil into the banana mixture. Use a hand mixer or a spoon for this step.

Add the rolled oats, oat flour and cinnamon a little at a time and combine well until a dough forms.

Turn the dough out onto a smooth surface.

Flatten the dough evenly with your hands or a rolling pin to about ¼ to ½ inch thickness.

Using a cookie cutter, cut out the dog treats and place them on a greased baking sheet or use parchment paper to cover the baking sheet.

Bake at 350 degrees for 20 to 25 minutes.