Melt margarine in a saucepan over medium heat; add flour. Cook 1 minute; stirring constantly with a wire whisk. Gradually add milk, stirring constantly. Bring to a boil; cook 1 minute, stirring constantly.
Remove from heat; add cheeses and next 4 ingredients, stirring until cheeses melt.
Combine cheese sauce and macaroni in a bowl; stir well.