01 - Set the oven to 300°F. Line two large baking sheets with parchment paper.
02 - Wash kale leaves thoroughly and dry completely with a salad spinner or clean kitchen towel. Remove stems and tear leaves into bite-sized pieces.
03 - Place kale pieces in a large mixing bowl and massage with olive oil until every leaf is evenly coated.
04 - In a small bowl, combine nutritional yeast, garlic powder, onion powder, smoked paprika, and sea salt.
05 - Sprinkle the seasoning mixture over the kale and toss well to ensure even coverage. Add Parmesan cheese if desired for extra cheesiness and toss again.
06 - Spread kale pieces out in a single layer on the prepared baking sheets without overcrowding.
07 - Bake for 20 minutes, rotating the trays halfway through, until the chips are crisp and just beginning to brown.
08 - Allow the kale chips to cool slightly before serving. Enjoy immediately for optimal crunch.