Cut the banana in slices. Place them on a kitchen paper and tap them dry. Let them rest while making the batter.
Mix the oat flour, protein powder, baking powder and baking soda together in a bowl.
Add the egg whites, milk, vanilla extract and agave syrup. Mix till smooth.
Tap the banana again with kitchen paper. Spread the banana slices with Biscoff spread.
Dip the banana in the batter with the Biscoff spread on top. Carefully place the batter on top of the Biscoff side. Take the banana out the batter with a fork.
Place it in a frying pan straight away. Fry the side with no Biscoff and flip them carefully.