Heat oven to 375 degrees. Cook macaroni as directed on package. Hear margarine in 3-quart saucepan over medium heat. Cook onion in margarine about 3 minutes. Stir in flour, salt and pepper. Cook, stirring constantly, until mixture is bubbly; remove from heat. Stir in milk. Heat to boiling, stirring constantly. Boil and stir 1 minute. Remove from heat. Stir in cheese until melted. Add macaroni and stir until coated. Pour into ungreased 1 1/2 quart casserole. Bake about 30 minutes or until bubbly and light brown.
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