Mash the banana in a medium bowl. Add the baking powder and mash together.
Add in the egg, oil, vanilla, butter and milk, and whisk together until just combined.
Stir in the oats and flour until fully combined. Fold in the chocolate chips until mixed in.
Heat a large skillet over medium heat and spray with cooking spray. Scoop 1/4 cup of batter for each pancake, and flip when bubbles are covering the surface of the pancake. Cook the other side until it is golden.