Add the flour and whisk until it starts to thicken and brown, about 3 minutes.
2 tablespoons all-purpose flour
Gradually pour in the chicken broth and whisk again until it starts to thicken, about 5 minutes.
6 cups chicken broth or leftover turkey broth
Add the carrots, celery and potatoes to the pan, reduce the heat to low medium and let it simmer for 10 to 15 minutes or until the potatoes become slightly tender.
1 cup chopped carrots, 3 stalks of celery, 2 cups yellow potatoes
In the meantime, make the dumplings by whisking the flour, baking powder, baking soda and salt together in a large bowl.
1 ¾ cup all-purpose flour, 2 teaspoons baking powder, ½ teaspoon baking soda, ½ teaspoon kosher salt
Stir in the stuffing, pour in the buttermilk and stir just until combined.
2 cups leftover stuffing, 1 ½ cup buttermilk
Once the soup is ready, stir in the heavy cream and turkey then scoop 1 to 2-inch balls of the dumpling mixture into the soup. (You should get about 15 dumplings.)
1 cup heavy cream, 2 cups shredded turkey
Cover the pan once again and let it cook for 10 to 15 minutes or until the dumplings are fully cooked through.
To test if the dumplings are cooked through, remove one from the pan, cut it open and see if there is any doughy part in the center.
Let the soup cool for 15-20 minutes before serving with freshly minced parsley for garnish if desired.
Notes
This soup can be stored in an airtight container in the fridge for up to five days.