I loved the mac and cheese we used to get at the Automats in New York because it was so creamy. Tried many 'Orginal Automat" recipes that called for preparing the mac and cheese and then baking it but that seemed to make its creamy cheese sauce dry up. Finally realized that they probably made it in huge pots, kept it warm, put some into a little oval dish, ran it quickly through the oven before loading it into one of those little window boxes for customers to choose from.
Checked out the recipe someone mentioned from Opah's site, almost 800 calories per serving, WOW!