Start adding the 40% pile of cheese in small handfuls, stirring and waiting for the first handful of cheese to melt and incorporate into the sauce before adding the next handful. Transfer the contents of the pan to a 2 1/2-quart (2.4 liter) ovenproof skillet or baking dish. The mixture will be runny but that’s okay. Mound the reserved cheese on top of the macaroni and place the dish on a rimmed baking sheet to catch any drips.☞ TESTER TIP: The mac and cheese mixture will be very runny when you pour the cream and pasta into the baking dish. Don't worry. It'll come out just fine.