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In a large saucepan, cook macaroni according to package directions; drain. Return macaroni to hot saucepan; cover and keep warm.
Meanwhile, for cheese sauce, in a medium saucepan heat butter over medium heat until melted. Add onion; cook until tender, stirring occasionally. Stir in flour and the 1/8 teaspoon pepper. Gradually stir in milk. Cook and stir over medium heat until slightly thickened and bubbly. Gradually add Cheddar cheese and American cheese, stirring until cheeses are melted.
Pour cheese sauce over cooked macaroni; stir to coat. Cook over low heat for 2 to 3 minutes or until heated through, stirring frequently. Let stand for 10 minutes before serving. If desired, sprinkle with additional pepper.