Mix dry ingredients together well in a large bowl.
Mash bananas with a fork or blitz quickly in a food processor. Add to dry ingredients and mix well.
Add oil and again stir through thoroughly so everything is incorporated into the mix.
Line a loaf tin with baking paper and pour mixture into tin. Sprinkle castor sugar over top.
Bake for 1 hour but check after the first 40 minutes and if it is browning too much on top, place a piece of foil loosely over the top to avoid burning. Remove from oven and allow to cool in tin.
Recipe by my vegan plate at https://www.myveganplate.com/banana-bread/