You'll need:
Leftover Turkey (As much as you want to use)
2 Boxes of Stove Top Stuffing
2 Jars of Turkey gravy. (usually found with the spices)

Prepare the Stuffing according to the directions on the box. Then spread the stuffing out evenly in the bottom of a 9x13 pan. Tear the leftover turkey into strips and cover the stuffing with it. You can layer it thick or thin, it's up to you. Pour the Turkey gravy over the top of that and bake in the oven at 375 for 10-15 minutes. Just long enough to warm everything back up. Ok, You're ready to serve!