In a blender, combine the rolled oats and milk; blend until smooth.
Add the ripe banana, egg, baking powder, vanilla extract, cinnamon, and salt to the oat mixture; blend again until well combined.
Let the batter sit for 5 minutes to thicken.
Heat a non-stick skillet over medium heat and add a little oil or butter.
Pour 1/4 cup of batter onto the skillet for each pancake.
Cook until 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 oil as needed.
Serve warm with your choice of toppings.
Enjoy your delicious and nutritious oatmeal pancakes!