We were at friends for leftovers this past weekend.
Mashed potatoes on the bottom; whatever veggies you have leftover; turkey for next layer - add a bit of gravy; stuffing on top with a bit of butter to brown. Since I'm not a stuffing person, I had more mashed potatoes on top. Her DH had sweet potatoes on the bottom layer vs mashed.
All worked well, was delish and got rid of tons of leftovers!