This is my Grandma Louise's recipe for a sweet potato casserole. I swear it is the best thing I have ever eaten. She makes it every Thanksgiving, Christmas, and Easter. If you are bringing this to a party, it can easily be reheated by covering it with aluminum foil, placing it in an oven at 350°F, and heating it for about 20-30 minutes or until just bubbling. Enjoy! Note: Prep time does NOT include time needed to prepate fresh sweet potatoes/yams.