Probably wouldn't want it for Thanksgiving necessarily, but recently I made a mashed potato casserole that was like the papas we love at Abuelo's, a Mexican restaurant we like.
I cut and cooked 8 Yukon Gold potatoes, skins on, and then mashed well. I added finely chopped onion, a small can of diced jalapenos, some butter, sour cream, salt, pepper and garlic powder. I mixed well, put it in a greased casserole dish and topped it with shredded colby jack and baked until hot and bubbly. It was so good!