In a food processor or blender, combine the oats, baking powder, and cinnamon. Blend until a flour consistency is achieved.
Pour the oat flour into a mixing bowl. Add the milk, maple syrup, vanilla, and eggs. Stir until everything is evenly mixed.
Add about 1/3 cup of batter to a greased pan over medium heat. After a minute or so, until the pancake is golden brown, flip and cook on the other side. Repeat with the remaining batter.
While the pancakes are cooking, make the apple topping. Add the butter to a pan over medium heat. When the butter has melted, add the chopped apple and cinnamon. Stir and cook until the apples begin to soften, about 6-8 minutes.
Top the pancakes with the apple topping and enjoy! These pancakes are best hot.