Adapted from allrecipes.com
cup all-purpose flour
teaspoon dry mustard
teaspoon ground black pepper
(8 ounce) packages elbow macaroni
cups shredded sharp Cheddar cheese
(8 ounce) packages processed American cheese, cut into strips
Preheat oven to 350 degrees F (175 degrees C). Melt butter in a medium saucepan over medium heat. Stir in flour and cook 1 minute, stirring constantly. Stir in milk, salt, mustard and pepper; cook, stirring frequently, until mixture boils and thickens. Meanwhile, bring a pot of lightly salted water to a boil. Add macaroni and cook for 8 to 10 minutes or until al dente; drain. To the milk mixture add the Cheddar and American cheeses; stir until cheese melts. Combine macaroni and cheese sauce in a 4 quart baking dish; mix well. Sprinkle with bread crumbs. Bake in preheated oven for 40 minutes, or until hot and bubbly. Cover with foil for 1/2 of baking time if getting too dark. Let cool 10 minutes before serving. Makes 12 servings.