Take your leftover garlic mashed potatoes. Put in a large stock pot, add water to thin it out some.
Add leftover turkey chunks, pepper, salt, basil, and anything else your heart desires. Bring to a slow boil and even consistancy.
Nuke an additional potato or two in the microwave. Cut into chunks and add to soup as it's cooking so you have some potato chunks to balance the turkey chunks.
Once cooked, ladle into soup bowls. Use an ice cream scooper, and add a big scoop of nuked leftover stuffing to the middle of each bowl like a big old matzoh ball. If you're a "nuts in the stuffing" type, it's an added bonus.
Enjoy!