1 hr 30 min — Medium — American
Both shredded and diced extra-sharp yellow and white cheddar go into this béchamel-based sauce, so melted pools form throughout the pasta as it bakes. Grated yellow onion, dry mustard, a pinch of cayenne, and freshly grated nutmeg season the roux before the milk and heavy cream go in. The broiler finishes the top to a bubbly, golden crust. Serves 10, which means this is worth making for a gathering rather than a weeknight table of four.