In A Dutch Oven Coated With Nonstick 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).