1/4 lb. macaroni, boiled
2 c. thin white sauce
2 tbsp. prepared mustard
1/2 c. buttered crumbs
1/2 lb. grated Cheddar cheese

Arrange the macaroni, sauce, and cheese in layers in a buttered baking dish. Pour white sauce over layers. Cover with buttered crumbs. Bake until crumbs are brown (about 15 minutes in 400 degree oven).