In a separate bowl, mash the banana. Add in the milk, vanilla extract and melted butter. Mix well. Pour ingredients into the bowl with egg.
Add in the flour, baking powder and cinnamon. Mix until combined.
Heat your waffle maker according to manufacture's instruction. When hot, use ¼ measuring cup to scoop the batter onto the waffle maker.
Cook until the waffle is crispy and brown, about 3-4 minutes for my Oster 8 inch waffle iron.
Whole wheat flour - Available at health food stores like Whole Foods or Sprouts in the bulk foods section. Bob’s Red Mill is also a good brand. If you do not have whole wheat flour, you can substitute it with everyday baking flour (organic and unrefined is a good option.)Banana - Make sure to use ripe bananas, it adds a bit more sweetness. Use bananas that are soft with brown spots on the peel. Waffle Maker - I use an Oster 8-inch round waffle maker. Check your waffle maker for the appropriate settings. I use the medium high setting to preheat and cook. Make smaller waffles by using a ¼ measuring cup to scoop the batter. To store - Let waffles cool completely and then place in an airtight container and place in the fridge or freezer. Will keep in the fridge for up to 2 days. To reheat frozen waffles, defrost them in a toaster oven for about 5-6 minutes at 300 Fahrenheit.