Melt the chocolate in 20-second bursts in the microwave, or in a heatproof bowl set over a pan of simmering water, ensuring the base of the bowl doesn’t touch the water. Leave to cool for 10 mins. Unwrap the cake, remove it from the tin and peel off the parchment. Drizzle over the melted chocolate, letting it drip down the sides, and crumble over the extra cookies. Serve, or chill for up to 1 hr.
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.