Put butter in large microwave bowl. Nuke 1 minute. Stir in salt, flour, and pepper; blend well. Put 2 cups milk in glass. Cook on HIGH 2 minutes. Gradually stir into flour mixture, blend until smooth. Stir in cheese. Cover with plastic wrap and nuke 2 more minutes. Add macaroni; toss throughly and nuke 2 to 3 more minutes. Then eat.