Preheat the oven to 350 degrees F. Line 2 sheet pans with parchment paper.
With a sharp knife, remove and discard the hard rib from the center of each leaf, leaving the leaves as intact as possible. Place them on the sheet pans, drizzle or brush them with olive oil, and toss to coat lightly. Sprinkle generously with salt and bake for 10 minutes, until crispy. Sprinkle lightly with Parmesan cheese and bake for another 5 minutes. Cool and serve.