Place all ingredients in a blender until oats are ground and there are no chunks of bananas, about 1 minute.
Ideally, let the batter sit for 15-30 minutes to allow the oats to hydrate. I have cooked them right away, but the pancakes turn out better and fluffier if it sits.
Heat a nonstick griddle or large nonstick pan over medium heat.
When hot, pour batter onto griddle and cook about 2-3 minutes per side.