Let your waffle iron heat up while you prepare your batter.
In a food-processor or blender, grind the oats until it becomes a fine flour.
In a mixing bowl, using a whisk, mix together the dry ingredients: oat flour, baking powder, salt and cinnamon. In another bowl, whisk together the wet ingredients: mashed banana, milk, coconut oil, eggs, maple syrup and vanilla extract.
Add the dry ingredients to the wet ingredients and combine until the batter is uniform.
Add the batter to the pre-heated waffle iron (use as much as recommended in the waffle maker instruction manual)
Let the waffle cook until crisp on the outside (around 5 minutes per waffle, depending on your waffle iron).
Serve with maple syrup, chopped bananas or your choice of fresh fruits.