1 lb. Italian sausage, casings removed
2 stalks celery, thinly sliced
1/2 yellow onion, chopped
1 tart apple (such as Granny Smith or Pink Lady), cored and chopped
1/2 tsp. each dried sage leaves and black pepper
1-1/2 cups low-sodium chicken broth
1/2 cup dried cranberries
fresh sage leaves for garnish