My Family'S Favorite Broccoli-Rice Casserole
["1 can mushroom soup", "1/2 stick margarine", "1/2 small jar Cheez Whiz", "1 pkg. frozen chopped broccoli, thawed", "1/2 c. chopped onion", "1 (2 oz.) can mushrooms (optional)", "3/4 c. instant rice"]
["Mix soup, margarine and Cheez Whiz in a large saucepan and heat until well blended.", "Bake, uncovered, at 350\u00b0 for 1 hour. Yields 4 to 6 servings."]
["mushroom soup", "margarine", "broccoli", "onion", "mushrooms", "instant rice"]