Dense in vitamins A, C, and K, fiber, and calcium, kale is one of the healthiest foods you can eat -- and it makes irresistible chips.
Heat oven to 350 degrees. Arrange kale on two rimmed baking sheets. Drizzle evenly with olive oil and toss. Season with salt. Bake, rotating trays once, until crisp, 12 to 15 minutes. Toss with lemon zest.