In a mixing bowl, whisk together the oats, flour, baking powder, baking soda, and salt.
In a separate bowl, whisk together the almond milk, apple cider vinegar, coconut oil, maple syrup, and vanilla extract.
Pour the wet ingredients into the dry ingredients and mix until just combined.
Add the mashed banana and mix until just combined.
Heat a greased frying pan over medium heat. Drop 1/4 cup of batter onto the pan for each pancake and cook for 2-3 minutes, or until golden brown. Flip and cook for another 2-3 minutes, or until golden brown.
Serve the pancakes topped with banana slices and a sprinkle of powdered sugar. Enjoy!