In a bowl put flour, sodium bicarbonate and baking powder.
Into another bowl put caster sugar, butter and whisk until it's light and fluffy. While whisking add 1 egg at a time.
Add the mashed bananas, vanilla essence along with the chopped walnuts and mix.
Slowly put in the flour and mix again.
Put the mixture into a loaf tin with butter paper at the bottom.
Bake in a pre-heated oven at 170 degrees for about 1 hour.
To Serve: Dust the bread with icing sugar and serve.
Key Ingredients: gramflour, baking powder, castor sugar, butter, egg, vanilla essence, banana, walnuts