Clean and cut your kale, pat dry. I buy mine at Trader Joe's all cleaned and ready to cook. Line a baking pan with foil, spread your kale across evenly. Spray a mist of olive oil across the kale leaves; make sure not to add too much cause they won't crisp up then. Sprinkle with salt, pepper and your cheese of choice. I prefer mozzarella. Bake at 350 degrees roughly 10-12 minutes or until golden on the edges. Be careful not to burn/overcook them. Sometimes I coat with Apple Cider Vinegar-- courtesy of Holly's suggestion-- for a tart taste also purchased at Trader Joe's.
Enjoy. A healthy, quick snack with the naughty feel of eating high calorie potato chips.