Low Cholesterol Macaroni And Cheese
["1 1/2 c. uncooked elbow macaroni", "1 medium onion, peeled and chopped", "1 Tbsp. margarine", "2 Tbsp. flour", "1/4 tsp. pepper", "1/4 tsp. oregano", "2 c. skim milk", "1 c. (4 oz.) shredded low-fat Swiss cheese", "1 c. (4 oz.) shredded low-fat Cheddar cheese", "1/4 c. chopped fresh parsley", "1 medium tomato, chopped (optional)"]
["Cook elbow macaroni according to package directions, omitting oil and salt; drain.", "Rinse macaroni under cold running water and drain again.", "Set macaroni aside."]
["elbow macaroni", "onion", "margarine", "flour", "pepper", "oregano", "milk", "Swiss cheese", "Cheddar cheese", "fresh parsley", "tomato"]