Preheat waffle iron to the medium-high setting according to manufacturer specifications.

Place rolled oats into a high-speed blender and process until a fine flour consistency is reached.

Add bananas, eggs, almond milk, baking powder, vanilla extract, cinnamon, and salt to the oat flour in the blender.

Pulse and blend on medium speed until the batter is completely smooth and homogeneous.

Lightly coat the waffle iron plates with non-stick cooking spray or vegetable oil.

Pour approximately 0.5 to 0.75 cups of batter onto the center of the preheated waffle iron.

Close the lid and cook for 4 to 6 minutes until the waffle is golden brown and the exterior is firm.

Remove the waffle using heat-resistant tongs and repeat the process with the remaining batter.