Sure, you could just pop the top on a jar of store-bought nacho cheese sauce, but what's the fun in that? Even more importantly, what control does that give you? Not much: You can't choose what kinds of cheese go into the sauce, nor how spicy it is, and whether you add pickled jalapeños or not. But with this dead-easy homemade nacho cheese sauce, you can make those decisions, and end up with a silky, gooey, perfect nacho cheese sauce of your own design. Whenever you want.