Preheat oven to 350°F (180°C) and fold a 7 inch x 7 inch (15 cm x 15 cm) brownie pan with parchment paper.
In a large bowl, mash the banana. Once mashed, beat it with egg, Greek yogurt, maple syrup, vanilla extract and a pinch of salt.
Sift in oat flour, optionally protein powder (if using) and baking powder. Start mixing, adding the milk gradually until the batter is smooth.
Fold in any additional ingredient you'd like, such as strawberries or chopped nuts.
Transfer the batter to the prepared baking ban and top with strawberries, if you desire.
Bake pancakes in hot oven for 15 to 20 minutes, or until a toothpick inserted in the center comes out clean. Once ready, remove them from the oven and allow to cool for at least 5 minutes before serving.