Preheat oven to 200℃/392℉.
Place baking sheet on baking tray. Sprinkle on parmesan in whatever size shape you want, remembering that it will spread, and you don't want the crisps to touch. Ensure there's not too much parmesan per shape, otherwise it will just be melty without the lattice-pattern you're looking for.
Bake for about five minutes or until golden. Keep an eye on them.
Remove and allow to cool and crisp up. Use on top of a salad or anywhere you'd normally sprinkle a little parmesan. Can be a snack on its own. Store in an air-tight container for a day or two.