Cranberry Streusel Sweet Potatoes Have used this recipe for the past 2 years, and keep going back to it. I was never a fan of the marshmallow topping version. The family all love this version better, and it is really easy. Like most recipes I try, I do add stuff to them as needed. I added some brown sugar and cinnamon to the sweet potatoes, and some brown sugar to the topping. (I never measure, but enough to taste.)