Green Bean Casserole
["chopped onion to taste", "1/4 c. margarine", "2 cans green beans, drained", "8 oz. sour cream", "grated cheese"]
["Saute onion in margarine until tender.", "Add beans and sour cream. Bake at 325\u00b0 for 30 minutes. Top with cheese and heat until cheese melts."]
["onion", "margarine", "green beans", "sour cream", "grated cheese"]