I also do a sweet potatoe casserole, but I use canned sweet potatoes and walnuts instead of pecans. We went to Thanksgiving dinner at my brother's house one year, and my sister in law's sister in law brought it. We loved it, and dh made me get the recipe before we left. I made it the next Thansgiving and it was a hit, so now it is expected at every major holiday: Thanksgiving, Christmas, and Easter.
Elena