01 - Preheat the oven to 350°F. Line an 8×8-inch square baking pan with parchment paper, leaving an overhang on two sides for easy removal.
02 - In a large mixing bowl, whisk together the melted butter, granulated sugar, and brown sugar until smooth and glossy.
03 - Add the eggs and vanilla extract to the sugar mixture, whisking until well combined and slightly lightened in color.
04 - Sift the cocoa powder, flour, and salt directly into the wet mixture. Gently fold with a spatula until just combined — avoid overmixing to keep the texture tender.
05 - Pour the batter into the prepared pan and smooth the top evenly. Bake for 23–25 minutes, until the edges are set but the center still looks slightly underbaked. Cool completely in the pan on a wire rack.
06 - Place the chopped chocolate and butter in a heatproof bowl. Heat the heavy cream in a small saucepan until just steaming — do not boil — then pour it over the chocolate. Let sit for 2 minutes, then stir gently until smooth and glossy.
07 - Spread the ganache evenly over the cooled brownie base. Sprinkle the candy-coated chocolate chips uniformly across the surface. Refrigerate for at least 30 minutes, or until the ganache is fully set.
08 - Using the parchment overhang, lift the brownie slab out of the pan. Slice into 12 even bars with a sharp knife. Serve chilled or at room temperature.