1 cup butter melted
1/2 cup unsweetened cocoa powder
2 cups all-purpose flour
2 cups sugar
4 large eggs, lightly beaten
1 tablespoon vanilla extract
1/4 cup butter, softened
1/4 cup milk
1/4 cup unsweetened cocoa powder
3 cups confectioners’ sugar
1 teaspoon vanilla extract
Preheat oven to 350 degrees and line a 9×13-inch baking pan with foil. Spray foil with non-stick cooking spray.
In a large bowl, whisk melted butter and 1/2 cup cocoa powder together until smooth.
Add remaining brownie ingredients and stir until evenly combined.
Pour batter into prepared pan and bake 25 to 30 minutes.
Let brownies cool 15 minutes and then frost. (They should still be somewhat warm when you frost them.)
To make frosting, use an electric mixer to beat together all frosting ingredients until smooth. Spread frosting on brownies.