Heat waffle iron. Lightly spray w/ oil (optional).
Place ingredients in a high powered blender along with 1/4 tsp salt. Blend about 30 seconds, stirring as needed.
If not using a blender, mash the egg, banana, and peanut butter well, and then stir in remaining ingredients.
Pour half of the batter into the center of the waffle maker. Let cook for 5-7 minutes, or until they are browned and lid can be lifted without sticking.Make a second waffle.
Mix the PB drizzle in a cup with a fork.
Add water to thin, if needed