Banana Bread

80g butter, softened
110g (just over half a cup) caster sugar
60g (about 1/3 cup) dark brown sugar
1 tsp vanilla extract
1 egg
275g ripe banana flesh, mashed well (about 4 small to medium bananas - just over 1 cup of flesh) 100g unsalted chopped walnuts
250g (just under 2 cups) SR flour
half a tsp bicarb soda

Grease and line a 20cm loaf tin or similar. Preheat oven to 180C.
Beat the butter with the sugars until very light and pale. Beat in the vanilla and egg. Fold in the banana and nuts.
Sift the flour with the bicarb soda and fold in. Pour into the loaf tin and bake for about 40-55 minutes or until coooked through. Test with a skewer.