2 very ripe bananas, peeled and mashed
250g/9oz plain flour
1 tsp baking powder
录 tsp bicarbonate of soda
200g/7oz golden caster sugar
25g/1oz cocoa powder
50g/2oz toasted chopped hazelnuts
pinch salt
100g/3陆oz good-quality white chocolate, chopped
125驳/4陆辞锄 butter, melted
2 free-range eggs, beaten