Preheat the oven to 400⁰F. Prepare a baking sheet by lining it with parchment paper. Then peel and cut the bananas in half lengthwise. Line halves up on the baking sheet, cut side up.
Sprinkle the sugar and spices evenly over the bananas. Then bake at 400⁰F until the bananas are caramelized, about 15 minutes.
Prepare the topping by whisking together the peanut butter, water, and maple syrup until smooth.
Prepare the waffles: Preheat the waffle iron. Then whisk together the flour, baking powder, and salt in a medium-sized bowl or large measuring cup.
Whisk together the peanut butter, sugar, milk, and vinegar in a separate bowl. Then mash the roasted bananas into the wet mixture until evenly combined. Lightly coat the preheated waffle iron with butter, then spoon about ¼ cup of the batter onto the iron, and close and cook until both sides of the waffle are golden brown, about 2 minutes per side.
Repeat the above steps until there is no longer any batter. Keep finished waffles warm in the oven until ready to serve. Then serve with the maple peanut butter topping and fresh blueberries.