Cook macaroni in boiling water until tender; drain. In 2-quart saucepan, melt butter; blend in flour. Add milk. Cook and stir over medium-low heat until thick. Add salt, pepper and cheese, stir until cheese is melted. Add macaroni. Turn into a 1 1/2-quart casserole. Bake at 350° about 45 minutes. Serves 6.