2 very ripe bananas (about 250g/9oz total weight)
a little demerara sugar
75驳/2陆辞锄 hazelnuts
175g/6oz good-quality dark or milk chocolate chips
175g/6oz self-raising flour
175g/6oz sugar (half light muscovado, half golden caster)
drop vanilla extract
175g/6oz unsalted butter, softened
2 free-range eggs