2 tsp. butter
1/2 tsp. salt
1/8 tsp. pepper
3 c. milk
1/2 c. all-purpose flour
1/2 tsp. dry mustard
1/8 tsp. onion powder
1 1/2 c. sharp Cheddar cheese, grated
5 c. cooked elbow macaroni

Heat butter until melted, add flour, mustard, salt, onion powder, and pepper. Cook until bubbly, about 1 minute, stirring constantly. Gradually stir in milk. Cook over medium heat until thick, 10 minutes, stirring constantly. Stir in 1 cup cheese until melted. Pour in 2-quart dish and sprinkle with remaining cheese. Cover and bake at 350 degrees for 30 minutes.