Add potatoes, onion, celery, carrots and chicken, cook for 15 minutes, stirring occasionally.
Pour in chicken broth; season with poultry seasoning, salt and pepper simmer all together for 15 minutes.
Pour in half-and-half and bring to a boil; add bacon bits.
In a medium bowl, combine biscuit mix with milk and mix well (dough should be thick). Drop tablespoon sizes of dough into boiling mixture; reduce heat and simmer for 10 minutes uncovered, then another 10 minutes covered. (Note: Do not stir while simmering, or dumplings will break apart). Serve hot.