For the brownies: Melt the butter and chopped chocolate in a medium saucepan on medium heat, stirring constantly, about 5 minutes. Or melt in a medium microwave safe bowl in 20 second increments, stirring after each, in the microwave. Remove from the heat, pour into a large mixing bowl, and allow to slightly cool for 10 minutes.
Adjust the oven rack to the lower third position and preheat oven to 350F degrees. Line the bottom and sides of a 9×13 baking pan* with aluminum foil or parchment paper, leaving an overhang on all sides. Set aside.
*You’re probably wondering what else I could possibly write about brownies, but I want to let you know that this brownie recipe is a combination of these brownies and these brownies, only made into a larger batch for a bigger pan. If you’d like to make today’s recipe in a 9×9 or 8×8 size square baking pan, please halve the frosting and the chocolate topping. Then use this brownie recipe as the bottom layer.