½ cup (115g) unsalted butter 200g dark chocolate ¾ cup granulated sugar ¼ cup brown sugar 2 large eggs 1 tsp vanilla extract ½ cup all-purpose flour 2 tbsp cocoa powder ¼ tsp salt 3–4 Cadbury 5 Star bars
Set the oven to 175°C. Line an 8x8-inch pan with parchment paper and leave the edges hanging out for easy removal.
Melt butter and dark chocolate on low heat. Stir until smooth then set aside to cool.
Whisk in granulated sugar and brown butter into the cooled chocolate and stir until it becomes glossy and thick.
Whisk in eggs one by one then stir in vanilla for flavor.
Sift in flour, cocoa powder, and salt then fold until well mixed without overmixing. Fold in chopped chunks of 5 star chocolate then pour the batter into lined tin.
Bake for 25–28 minutes until edges are set. Let cool before removing to keep the shape stable then slice to serve.