In a large bowl, whisk together flour, baking powder, cinnamon and salt.
In a small bowl, whisk together milk, oil, bananas and egg yolks. Add to flour mixture and stir until just combined. Gently fold in beaten egg whites.
Spray the griddle with nonstick cooking spray. Ladle ⅓ cup batter onto the griddle for each pancake. Cook until bubbles form on top and the pancakes are golden underneath, 1 to 2 minutes. Flip the pancakes and cook for 1 minute more. Repeat with the remaining batter.