100g/3陆oz gluten-free plain flour
280g/10oz caster sugar
50驳/1戮辞锄 cocoa powder
125驳/4陆辞锄 milk chocolate (or more dark chocolate), broken into pieces
60驳/2录辞锄 milk chocolate chips
125驳/4陆辞锄 dark chocolate, broken into pieces
60驳/2录辞锄 dark chocolate chips
60驳/2录辞锄 white chocolate chips
250g/9oz unsalted butter, chopped into small pieces, plus extra to grease
4 free-range eggs