275²µ/9¾´Ç³ú plain flour
1 tsp baking powder
1 tsp bicarbonate of soda
275²µ/9¾´Ç³ú light brown soft sugar
pinch salt
1 tsp vanilla extract
175g/6oz dark chocolate (70% cocoa solids), chopped
175g/6oz dark chocolate
135g/4¾oz unsalted butter, at room temperature
250ml/9fl oz double cream
2 large free-range eggs, beaten
300ml/10fl oz milk (at room temperature)