Preheat oven to 350F and line a 9-inch square baking dish with parchment paper. Set aside.
Place butter in a microwave-safe bowl and microwave 30-60 seconds on high until melted. Use a handheld electric mixer on high (or a lot of elbow grease with a regular whisk) to mix in both sugars well for about 60 seconds of mixing. Mix in eggs and vanilla until smooth.
Add flour, cocoa, and salt to bowl and fold until batter is just combined.
Scrape batter into prepared pan and smooth top. Bake brownies at 350F 25-30 minutes until a toothpick inserted into brownies comes out with moist crumbs sticking to it. Allow brownies to cool completely on a wire cooling rack.
Cookie Dough
In a large bowl, beat butter and both sugars together until smooth and creamy. Fold in vanilla, flour, and just enough milk to achieve a cookie dough-like texture. Fold in chocolate chips.
Spread cookie dough mixture evenly over cooled brownies. Slice brownies into squares and serve. Enjoy!
Notes
Storing InstructionsStore brownies in an airtight container at room temperature up to 4 days.