I literally throw most every leftover into my soup. If you feel like it, even add sweet potatoes.
Turkey Carcass, meat removed
1 Sweet Onion, whole
1 bunch of Parsley
2 stocks of Celery
2 Carrots
Use any leftover Gravy
Use any leftover Stuffing
Use any leftover Green Bean Casserole, or Veggie.
Garlic Salt & Pepper, to taste
Put all ingredients into large soup pot and barely cover with water or turkey stock. Simmer for one hour on medium-high. When finished simmering, take out turkey carcass and taste the soup. At this time, you now need to add, garlic salt and pepper. This should be the best soup ever!