Preheat the oven to 350 degrees F. Spray a donut pan with cooking spray (I use coconut oil spray) and set aside.
In a bowl mash your banana, then whisk in your egg. Then add the vanilla, melted coconut oil, and coconut sugar. Stir to combine.
Slowly add in oat flour, then the baking powder, salt, and cinnamon. Fold in the chocolate chips.
Use a pastry bag or make your own using a large plastic bag to pipe the donut mixture in the prepared donut pan. (you can spoon the mix in, it just won't be as smooth)
Bake for 14-16 minutes or until they are cooked through/slightly browned around the edges.
Let them cool for about 5 minutes.