1.Heat the oven to 350°F. Line a 3-quart shallow baking pan with aluminum foil, dull-side down. 2.Heat the butter in a 3-quart saucepan over medium heat. Add the celery and onion and cook until they're tender, stirring occasionally. Stir in the broth, apple and cranberries. Remove the saucepan from the heat. Add the stuffing and mix lightly. Spoon the stuffing mixture into the baking pan. 3.Bake for 35 minutes or until the stuffing mixture is hot.