Place celery, carrots and broth in a large pot and bring to a boil. Cover and simmer until tender, about 10 minutes.
Place oil and onion into a large skillet and cook over medium heat until onion is tender, 4-5 minutes.
Sprinkle coconut flour over the onion then add in the heavy cream. Stir together until mixed. Add in the broth, carrots and celery into the skillet.
Sprinkle xanthan gum over the vegetables and broth in the skillet. Bring to a boil, reduce to medium low and continue to stir until mixture starts to thicken, about 10 minutes.
Once thickened, turn off heat and add in turkey and seasonings, taste and adjust salt and pepper if needed.
Pour into a 9 by 13 baking dish. Preheat oven to 375 degrees while you make the biscuits.