In a blender, combine the rolled oats and blend until they reach a flour-like consistency.
Add the ripe banana, milk, egg, baking powder, cinnamon, salt, and vanilla extract into the blender.
Blend the mixture until smooth and well-combined.
Heat a non-stick skillet over medium heat and add a small amount of butter or oil.
Pour 1/4 cup of the batter onto the skillet for each pancake.
Cook until small bubbles form on the surface, about 2-3 minutes.
Flip the pancakes and cook for another 2-3 minutes until golden brown.
Repeat with the remaining batter, adding more butter or oil as necessary.
Serve warm with your choice of toppings.
Enjoy your delicious banana oatmeal pancakes!