Ronzoni Macaroni & Cheese

• 2 tablespoons butter or 2 tablespoons margarine
• 1/4 cup finely chopped onion (optional)
• 2 tablespoons flour
• 2 cups milk
• 3/4 teaspoon salt
• 1/2 teaspoon dry ground mustard (optional)
• 1/4 teaspoon ground black pepper
• 2 cups uncooked elbow macaroni
• 2 cups shredded sharp cheddar cheese
• 8 ounces sliced American cheese, broken into 2-in . pieces

1. Heat oven to 350. In medium saucepan over medium heat, melt butter; add onion. Cook 2 minutes. Add flour; cook 1 minute, stirring constantly. Stir in milk and seasonings; cook, stirring frequently, until mixture boils and thickens.
2. Meanwhile, cook pasta according to package directions; drain. Stir cheeses in milk sauce. In 2-Qt. baking dish, stir together pasta and cheese sauce*. Bake for 30 minutes or until hot and bubbly.

butter, onion, flour, milk, salt, ground mustard, ground black pepper, elbow macaroni, cheddar cheese, american cheese

Taken from www.food.com/recipe/ronzoni-macaroni-cheese-358936 (may not work)