Preheat your oven to 350°Fahrenheit (175°Celsius). Line an 8x8-inch baking pan with parchment paper, leaving overhang for easy removal.
Brown the Butter:
Melt the 1 cup unsalted butter in a medium saucepan over medium heat, stirring frequently, until golden brown with a nutty aroma. Remove from heat and whisk in the 3/4 cup cocoa powder until smooth.
Make the Batter:
Stir in the 1 1/4 cup light brown sugar, 1/2 cup granulated white sugar, and 1 teaspoon vanilla extract until fully incorporated.
Let the mixture cool slightly, then whisk in the 3 large eggs, one at a time, until glossy and thick.
Stir in the 3/4 cup all-purpose flour and 1/2 teaspoon salt until just combined.
Fold in the 1/2 cup milk chocolate chips, ensuring they are evenly distributed.
Bake:
Pour the batter into the prepared pan, smoothing the top. Bake for 25–30 minutes, or until a toothpick inserted near the center comes out with moist crumbs (not wet batter).
Cool and Serve:
Allow the brownies to cool completely in the pan before slicing. For clean edges, chill in the refrigerator for 30 minutes before cutting.
Notes
Parchment Paper Trick: Line your square baking pan with parchment, leaving overhang on opposite sides for easy removal.
Use a Kitchen Scale: Measure flour and cocoa powder for consistent results—this avoids overly dense or dry brownies.
Perfect Bake Time: Bake until moist crumbs stick to a toothpick; this ensures a fudgy texture without overbaking.
Cool Completely: Let the brownies cool on a cooling rack before cutting with a sharp knife for clean edges.