This indulgent pasta dish features tender pipetti or shells coated in a silky cheese sauce. A roux of butter and flour is whisked with milk to create a smooth base, seasoned lightly with pepper. White cheddar and American cheeses melt into the sauce for creamy richness, while Parmesan adds a nutty finish. For an extra fun presentation, serve the mac and cheese in warm bread bowls, making it both comforting and impressive.