Can You Actually Freeze Nacho Cheese Sauce For Later? - Tasting Table
Briefly

Freezing nacho cheese sauce is entirely possible, and it's a great way to make sure it all gets used. However, it's really only recommended with homemade nacho cheese sauce and not with store-bought sauce.
A homemade sauce thaws better since there aren't as many additives. It usually begins with a roux made with butter and flour. Milk is then added, and then cheese and salt.
We think American cheese is the absolute best type of cheese for nachos because it melts especially well, and it will perform just as well after it's been frozen and reheated.
If you plan to use your sauce within five days, you can simply place it into the refrigerator. However, if you don't know when you'll make nachos again, place the cheese sauce into an airtight container.
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