Slow Cooker Chicken & Dumplings

1 1/2 lb. skinless boneless chicken breast, cut into 1"
2 med. potatoes, cut into 1" pieces
2 c. whole baby carrots
2 stalks celery, sliced
2 (10 3/4-oz.) cans cream of chicken soup
1 c. water
1 tsp. dried thyme leaves, crushed
1/4 tsp. black pepper
2 c. all-purpose baking mix
2/3 c. milk

Place chicken, potatoes, carrots and celery in 6-qt slow cooker. Mix soup, water, thyme and black pepper. Pour over all. Cover and cook on Low 7-8 hours (4-5 hours on High) or until chicken is done. Mix baking mix and milk. Spoon batter over chicken mixture. Tilt lid to vent and cook on High 30 mins or until dumplings are cooked in center. Serves 8