In a blender, combine the rolled oats and blend until a flour-like consistency is achieved. Transfer this oat flour to a mixing bowl.
In the blender, add the ripe banana, grated apple, eggs, baking powder, ground cinnamon, vanilla extract, milk, and a pinch of salt. Blend until smooth and well combined.
Pour the blended mixture into the bowl with oat flour and stir until thoroughly combined. Allow the batter to sit for about 5 minutes to thicken.
Heat a non-stick skillet over medium heat and add a small amount of coconut oil or butter to coat the pan.
Using a ladle, pour about 1/4 cup of batter onto the skillet for each pancake. Cook for 2-3 minutes, or until bubbles form on the surface and the edges start to look set.
Carefully flip the pancakes and cook for an additional 2-3 minutes on the other side, until golden brown.
Repeat until all the batter is used, adding more oil or butter to the skillet as needed.