The brownies that sport this absolutely yummy Peanut Butter Streusel can be either homemade or from a mix; you get to choose your favorite way of making them. Then you just sprinkle this mixture over the batter and wait while it's baking for the first bite. I believe I separated this recipe out from a longer one which included the batter. That's because I'm not one to mix up the batter when I can just open a box. Besides, America's Test Kitchen just printed an article about creating as delicious a fudgy brownie from scratch as you can get from a box. I admit, I do feel vindicated!