1. Preheat the oven to 350ºF (180ºC.)
2. Put the kale on a baking sheet and drizzle with the olive oil, then massage it into the leaves.
3. Spread the kale leaves in an even layer on the baking sheet and put in the oven. After about 5 minutes, use a spatula to separate any leaves of kale that are clumping together.
4. Continue cooking the kale for about 20 minutes, until the leaves are crisp. Remove from the oven and sprinkle fairly generously with salt.