Combine broth, butter, celery, mushrooms, parsley, onions, sage, poultry seasoning, salt, basil and pepper in a large saucepan; simmer for 10 minutes. Place bread cubes in a large bowl. Combine eggs, soup and chicken; stir into broth mixture until smooth. Pour over bread and mix well. Place mixture in a greased 5-quart slow cooker. Cover and cook on LOW for 5 hours or until a thermometer inserted into center of stuffing reads 160°F. Note: Stuffing can also be placed in a greased, covered casserole dish, and baked at 275°F for 3 hours.