Line a 9 * 6 inch or 8 * 8 inch tray with baking paper and lightly grease with spray oil or vegan butter.
Blend together bananas, vegan butter and maple syrup in a large bowl using a hand blender. You could also just mash the bananas well or blend them together in a food processor.
Add oats, coconut, walnuts, baking powder, cinnamon and flax to the wet ingredients. Mix well and then transfer to your prepared tin.
Bake in the preheated oven for 25 minutes. Allow to cool before slicing. Store Flapjacks in the fridge. Also delicious given a little heat up in the microwave before serving like you would a cookie.