250g/9oz plain flour
1陆 tsp baking powder
65g/2录oz soft light brown sugar, any lumps crumbled
125驳/4陆辞锄 golden caster sugar
45驳/1陆辞锄 cocoa powder
125驳/4陆辞锄 milk chocolate chips, or try a mixture of milk and white
陆 tsp fine salt
1 tsp vanilla extract
110g/3戮oz unsalted butter, melted, plus a little extra for greasing
150ml/5fl oz buttermilk (or milk plus 1 tbsp lemon juice)
2 free-range eggs