Preheat and grease your waffle maker. Set it aside.
In a bowl, mash the banana until smooth. Add in almond milk and apple cider vinegar. Mix well. Next, add in cornstarch, oat flour, and baking powder. Mix until everything is well incorporated.
Pour batter into the waffle maker. I am using ¾ cup of batter per waffle, but the amount may vary for a different waffle iron.
Transfer cooked waffles onto a cooling tray immediately. Serve and enjoy !