160²µ/5¾´Ç³ú plain flour
½ tsp bicarbonate of soda
110²µ/3¾´Ç³ú caster sugar
30g/1oz cocoa powder
90g/3¼oz light muscovado sugar
¼ tsp sea salt
1 tsp vanilla extract
sprinkles, such as chocolate chips, toasted coconut, chopped toasted nuts or hundreds and thousands, to serve
50²µ/1¾´Ç³ú dark chocolate chips or chopped-up dark chocolate
200g/7oz milk or dark chocolate, melted
115g/4oz unsalted butter, at room temperature
1 large free-range egg
10 full scoops ice cream (any flavour)