I had something like this from the frozen section of Trader Joe's. I loved it and still love it, but seeing how we don't have a Trader's here, I had to make something up on my own. It freezes well. If you choose to prepare it and freeze it, do NOT cook your sweet potatoes. When you de-freeze your mixture, it will cook and seeing how sweet potatoes become mushy when over cooked, freeze the mixture raw to begin with.
Takes about 45 min to make
Freezes well, but if you are freezing it, cook your sweet potatoes a bit less because when you defrost your food, it will cook again a little.