Mash the banana and add to a large mixing bowl.
Add egg, milk, yogurt, sugar and melted butter and mix to combine.
In a separate bowl, combine the flours, baking powder, baking soda, cinnamon
Slowly add the dry ingredients to the wet until incorporated. Do not overmix.
Allow batter to rest for a minute or two while the waffle iron preheats.
Preheat the waffle iron to medium heat and grease if it is not nonstick.
Add the batter to the waffle iron in a thin even layer (about 2/3 cup), keeping in mind that the batter will continue to rise and spread as it cooks.
Cook for 6-8 minutes or until the waffle has cooked through and has reached the desired level of crispiness.
Remove and serve warm.