Preheat and prepare a waffle iron following the manufacturer’s instructions.
In a large bowl, whisk together the flour, baking powder, salt, and sugar.
In a separate bowl, combine the flaxseed, banana, almond milk, vegan margarine, vanilla, and cinnamon and beat with an electric handheld mixer. Add the flour mixture and beat until smooth.
Make the topping: In a shallow bowl, combine the sugar and cinnamon. Set aside.
Make waffles following the manufacturer’s instructions. As soon as you remove the waffles from the iron, place them in the dish with the cinnamon-sugar topping and flip a few times to get an even coating.
Serve the waffles hot with sliced bananas over the top. You’ll want to slice the bananas as you serve your waffles to keep them from browning.