125g/4陆oz shop-bought salted caramel sauce
3 tbsp coffee granules
397g tin condensed milk
600ml/20fl oz evaporated milk
200g/7oz plain flour, sifted, plus extra for dusting
1 tsp baking powder
1 tsp bicarbonate of soda
190g/6陆oz soft brown sugar
30g/1oz cocoa powder
pinch salt
1 tbsp vanilla extract
1 tsp vanilla bean paste
150g/5陆oz unsalted butter, softened, plus extra melted butter for greasing
1 free-range egg
4 free-range eggs
230ml/8fl oz full-fat milk