In a large mixing bowl, sift in your flour, baking powder, sweetener, and salt together.
In a separate mixing bowl, whisk together the milk, vanilla extract, egg whites, and mashed banana. Whisk until well combined and smooth.
Add the dry ingredients into the wet ingredients and mix well until your pancake batter is well combined.
Over medium heat, set a non-stick pan or griddle on the stove and lightly grease with non-stick cooking spray. Using a ladle or measuring cup, pour 1/3 cup scoops of pancake batter onto your hot pan. Cook for about 1-2 minutes until you start to see bubbles form on the surface and the bottom is golden brown. Flip your pancake using a spatula and cook the opposite side for another 1-2 minutes until golden brown on both sides.
Serve immediately with your favorite pancake toppings. Maple syrup, powdered sugar, butter, whipped cream, and/or fresh berries are all great options!