The chains almost always have a central commissary for big batch prep of the micro reheat menu items.
Prep then vacuum seal and send it out on a truck.
If you are wanting to add a queso dish to your menu stay away from the neon orange canned stuff.
If you start experimenting with recipes stay away from any form of cheddar (greasy, even with a roux) and neverever use Velveeta (sticky/gummy).
The loaf type premium American cheese will always give you the best...