For the best texture, always grate your cheese from a block rather than using pre-shredded cheese, which often contains starches that inhibit crisping. You can substitute part of the cheddar with Colby or Monterey Jack for a milder flavor, but keep at least some Parmesan for extra crunch. To re-crisp leftover cheese crisps, warm them on a parchment-lined baking sheet in a 250°F oven for a few minutes until they regain their snap. These crisps are delicious on their own, crumbled over salads for crunch, or served alongside keto soups and dips.