These were really good! Next time I may add just a touch more sugar (American palates being obsessed with sugar & all!) but the sweetness of the milk chocolate chips really went well with a lesser sweet muffin. Nice texture too! Note to American cooks: Caster sugar is just granulated sugar 90g butter is abound 7 Tbsp (almost a whole stick) Bake at 350 Degrees F. Yum! Thanks for the recipe! Might keep me out of the pastry shop!