Macaroni And Cheese Casserole
["2 c. elbow macaroni, cooked and drained", "1/2 c. margarine", "2 Tbsp. finely chopped onion", "1/4 c. flour", "1/2 tsp. salt", "1 1/2 c. shredded American cheese", "1/4 c. grated Parmesan cheese", "1/4 tsp. paprika", "2 c. milk", "1 fresh tomato (optional)"]
["Melt margarine in saucepan.", "Saute onion until transparent. Blend in flour and seasonings.", "Stir in milk gradually; cook until thickened.", "Add cheese; stir until melted.", "Add macaroni.", "Pour into a greased 2-quart baking dish.", "Slice tomato and arrange on top.", "Sprinkle Parmesan cheese over surface.", "Bake in a moderate 375\u00b0 oven for 30 to 35 minutes.", "Makes 6 servings."]
["elbow macaroni", "margarine", "onion", "flour", "salt", "American cheese", "Parmesan cheese", "paprika", "milk", "tomato"]