2 tsp baking powder
50g/2oz caster sugar
150ml/5fl oz maple syrup
100驳/3陆辞锄 medium oatmeal, plus extra for dusting
陆 tsp salt
300驳/10陆辞锄 self-raising flour
100驳/3陆辞锄 walnuts, roughly chopped
100驳/3陆辞锄 wholemeal flour
160g/5陆oz unsalted butter, softened, plus extra for greasing
125ml/4fl oz buttermilk