In a large stockpot, saute the chopped onion and celery in butter until tender, about 10 minutes. Stir in the flour, salt, pepper, garlic powder, thyme, savory and parsley flakes. Gradually add the milk. Bring the mixture to a boil. Cook and stir for two minutes, until thickened.
Add the cooked turkey and carrot pieces to the pot. Add enough turkey broth until the soup reaches the desired consistency. Cover and simmer for 15 minutes.
Add the peas to the pot. Cover and simmer for 15 minutes, or until the vegetables are tender.
