In a Dutch oven coated with cooking spray, saute celery and carrots for 5 minutes. Stir in the broth, poultry seasoning and pepper. Bring to a boil. Reduce heat; simmer, uncovered. Add the chicken.
For dumplings, combine biscuit mix and milk. Drop by tablespoonfuls onto simmering broth. Cover and simmer for 10-15 minutes or until a toothpick inserted into a dumpling comes out clean (do not lift cover while simmering).
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