Put the butter, sugars and cocoa into your largest saucepan and gently melt together, stirring regularly so the mixture doesn’t catch. Once the sugar granules have just about disappeared, take off the heat, tip into a bowl and leave to cool for 5 mins.
Healthy chocolate brownies
Heat the oven to 190C/170C fan/gas 5 and line a shallow 23cm square baking tin with baking parchment. Tip the beans, cocoa, coffee granules, xylitol, vanilla, eggs and yogurt into a large bowl. Blitz using a hand blender until smooth. Or, do this in a food processor. Add the baking powder, then blitz again.