In a large mixing bowl, mash up the bananas.
Add the dry ingredients: flour, cane sugar, baking powder, sea salt, and cinnamon into the bowl with the bananas.
Next, add in the melted butter and milk.
Mix to combine into a batter, you'll see small chunks of bananas, that's okay.
Preheat your waffle iron. I cooked these on setting 4 on my Cuisinart waffle iron. Measure ½ cup of batter into the waffle iron as I only let these fill the middle portion of my iron (but, you can adjust how much batter you use per waffle depending on your waffle iron).
Cook until golden brown, about 2 to 4 minutes, depending on your waffle iron. Repeat until all the remaining batter is gone.
Serve immediately with butter and maple syrup!
Store extra waffles in the fridge for up to 3 days, or freeze for up to 3 months.