Add bananas to a bowl, mash well.
Add eggs & vanilla to banana and mix, add sweetener (if using).
Add oat flour, baking powder, baking soda, salt and cinnamon and mix well.
Add in chocolate chips, mix again.
Line a 8x8 baking pan with parchment or lightly grease pan.
Spread mix evenly into pan, top with a few extra chocolate chips if you'd like.
Bake at 175ºC for 30-35 minutes.
Cut into slices & enjoy.
