Preheat your waffle iron and spray with cooking spray.

Whisk flour, oats, baking powder, cinnamon, and salt together in a large bowl.

In another bowl, mash bananas until smooth, then whisk in milk, eggs, coconut oil, and maple syrup.

Fold wet ingredients into dry ingredients until just combined, do not overmix.

Pour batter into the waffle iron according to your iron's instructions and cook until golden and crisp.

Stack waffles and top with sliced bananas and a drizzle of maple syrup.