In a medium saucepan combine uncooked wild rice and chicken broth. Bring to boiling; reduce heat. Simmer, covered, for 50 to 60 minutes or until rice is just tender. Remove from heat; do not drain.
Preheat oven to 325 degrees F. Meanwhile, in a large skillet cook mushrooms and onion in margarine or butter until tender; remove from heat. Stir in stuffing mix and undrained rice. Add toasted walnuts and cranberries. If mixture seems dry, stir in 1 to 2 tablespoons water.
Transfer stuffing to a 2-quart casserole. Bake, covered, for 25 to 30 minutes or until heated through. Makes 8 to 10 servings.