Boil the pasta in well-salted water for two minutes less than recommended on the package. Drain and set aside.
In a pot, melt butter and add mustard powder and cayenne. Toast for about a minute.
Add whole milk and heavy cream to the pot and bring to a simmer.
In a separate bowl, temper an egg by adding a little bit of the warm milk mixture. Then add the tempered egg to the pot.
Add American cheese, sharp cheddar cheese, mozzarella cheese, and Parmesan cheese to the pot off the heat. Stir continuously until the cheeses have melted smoothly and the sauce has slightly thickened.
Add the cooked pasta to the cheese sauce and coat evenly.
Transfer the mac and cheese to a baking dish and top with a combination of cheddar, mozzarella, and Parmesan cheese.
Bake in the oven until the top is golden brown and crispy.
Optional: Finish under the broiler for an extra crispy topping.
Allow the mac and cheese to rest for at least five minutes before serving to achieve maximum creaminess.
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