Preheat the oven to 350° F.
In a large mixing bowl, combine the oat flour, baking powder, baking soda, and cinnamon.
Make a well in the center of the bowl, then add in the mashed bananas, pure maple syrup, and oat milk.
Mix all liquid ingredients to combine, then slowly mix the wet ingredients into the dry to form a donut batter.
Gently fold in the chocolate chips.
Evenly distribute the batter between six cavities of a silicone donut pan.
Pop the donuts in the oven to bake for about 35 - 40 minutes.
Let the donuts cool completely before removing them from the pan.
Microwave 2 tbsp of chocolate chips with 1/2 tsp melted coconut oil until a drizzly consistency is achieved, about 35 seconds.
Dip each donut in the melted chocolate.
Add some rainbow sprinkles on top of each donut.
Enjoy the donuts immediately or pop them in the refrigerator to allow the chocolate glaze to harden.