Meanwhile, for cheese sauce, in a mmedium saucepan cook ionion in hot butter until tender but not brown. Stir in flour and pepper. Add milk all at once. Cook and stir over medium heat until slightly thickened and bubbly. Add cheese, stirring until melted. Stir in cooked macaroni. Tranfer mix to a 2-quart casserole. Top with bread crumbs.
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