You might need to buy:
- For the Brownies:
- butter
- unsweetened chocolate chopped about 1/2 cup
- sugar
- light brown sugar
- large eggs
- vanilla extract
- semisweet chocolate chips
- all-purpose flour
- baking powder
- For the Frosting:
- butter at room temperature
- unsweetened cocoa powder
- powdered sugar
- powdered sugar
- vanilla extract
- milk or cream