01 - Preheat 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 the melted butter, granulated sugar, and brown sugar together until smooth and glossy.
03 - Add the eggs and vanilla extract to the butter mixture, whisking until fully 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 with a spatula. Bake for 23–25 minutes, until the edges are set but the center still appears slightly underbaked.
06 - Remove from the oven and allow the brownie base to cool completely in the pan on a wire rack.
07 - Place the chopped semi-sweet chocolate and butter in a heatproof bowl. Heat the heavy cream in a small saucepan over medium heat until just steaming, then pour it over the chocolate. Let sit for 2 minutes.
08 - Stir the chocolate and cream mixture gently until smooth, glossy, and free of any lumps.
09 - Pour the ganache over the cooled brownie base and spread it into an even layer. Immediately sprinkle the candy-coated chocolate chips evenly across the surface.
10 - Refrigerate for at least 30 minutes, or until the ganache is fully set. Use the parchment overhang to lift the slab from the pan, then slice into 12 even bars and serve.