In a large mixing bowl, mix together the almond or oat milk, mashed banana, melted butter, and maple syrup. Then, add the baking powder, baking soda, vanilla, and cinnamon. Next, mix in the peanut butter powder. Finally, mix in the oat flour until combined. Pour the batter into 16-18 donut molds and bake for 25-30 minutes.
Once the donuts are done baking, set them aside to cool. Microwave the peanut butter and the chocolate in two bowls, separately. Then, use a knife to spread the chocolate and the peanut butter over the donuts.