In large, heavy pot, combine soup, water, chicken, celery, onion, salt, poultry seasoning, and pepper. Cover and cook over low heat about 1 1/2 hours.
Add potatoes and carrots; cover and cook another 30 minutes.
Remove chicken from pot, shred it, and return to pot. Add peas and cook only 5 minutes longer.
Add dumplings. To make dumplings: Mix baking mix and milk until a soft dough forms. Drop by tablespoonfuls onto BOILING stew. Simmer covered for 10 minutes, then uncover and simmer an additional 10 minutes.
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