Preheat your oven to 350 degrees F. Spray a 9x9-inch baking pan with nonstick cooking spray. Line it with parchment paper, then spray the parchment.
In a large saucepan, add the 3/4 cup butter, 1/2 cup light brown sugar, and 1/2 cup granulated sugar. Place over medium low heat until the butter is completely melted. You want the butter to be melted, not simmering, so this should only take a few minutes.
Add the 1/2 cup unsweetened cocoa powder and stir. Remove from heat and let it stand for 5-7 minutes to cool.
Add the 1 1/3 cup all-purpose flour, 1/4 teaspoon baking powder, 1/2 teaspoon salt, 2 teaspoon vanilla extract, and 1/2 cup milk. Stir until it is thoroughly mixed and smooth.
Reserve 1/4 cup of the 1 cup semi-sweet chocolate chips and set them aside.
Add the remaining 3/4 cup of chocolate chips to the pot and fold them in until they are evenly distributed through the batter.
Pour the batter into the prepared pan.
Sprinkle the reserved 1/4 cup of chocolate chips over the top of the batter.
Place in the preheated oven and bake for 25 minutes. The brownies should appear “dry” and the edges will be crispy. Cool in the pan for 30 minutes before slicing and enjoying!
Notes
Storage: Store leftovers in an airtight container at room temperature for up to 5 days. Freeze: You can freeze these brownies in the pan or slice them. Wrap them tightly in 2 layers of plastic wrap, a layer of heavy-duty aluminum foil, and place in a Freezer-safe container or freezer bag. Freeze for up to 2 months and thaw at room temperature when you are ready to eat.