Take a slice of cheese or a flat pile of shredded cheese & bake it at 350°F (175°C) for 10-15 minutes until it gets crisp. You wouldn't think they'd get as crisp as they do, but if they're chewy at first, just bake 'em a little longer.
I've used cheddar, longhorn colby, pepper jack, provolone . . . and they're wonderful. Pepper jack crisps are just to-die-for!
Be sure to use parchment paper on the pan when you make these, because they'll glue to the pan if you don't. Waxed paper or regular foil is not an option - although I've heard Reynolds makes a non-stick release foil that works.