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. Whisk until well combined and the batter has 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 to 25 minutes, until the edges are set but the center still appears slightly underbaked.
06 - Transfer the pan to a wire rack and let the brownie base cool completely in the pan.
07 - Place the chopped chocolate and butter in a heatproof bowl. Heat the heavy cream in a small saucepan over medium heat until just steaming — do not boil — then pour it over the chocolate. Let sit for 2 minutes.
08 - Stir the chocolate and cream mixture gently until smooth, silky, and glossy.
09 - Spread the ganache evenly over the cooled brownie base. Immediately sprinkle the candy-coated chocolate chips across the surface in an even layer.
10 - Refrigerate for at least 30 minutes or until the ganache is fully set. Lift the brownie slab from the pan using the parchment overhang, slice into 12 bars, and serve chilled or at room temperature.