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Preheat the oven to 350ºF. Arrange 3 oven racks evenly spaced in the oven.
Lay each kale leaf on a board and, with a small sharp knife, cut out the hard stem. Tear large leaves in half. Place the kale in a large bowl of water and wash it well. Drain the kale and dry it in a salad spinner. Dry the bowl, and put the kale back in the bowl.
Toss the kale with the olive oil, 1 teaspoon kosher salt, and 1/2 teaspoon pepper. Divide the kale among 3 sheet pans or roast them in batches. If you put too much kale on one pan, it will steam rather than roast and will never become crisp. Roast for 15 minutes, until crisp. Sprinkle with fleur de sel and serve hot.