Preheat oven to 350 degrees. Remove kale stems. (Stems cause bitter taste.) Rinse kale leaves thoroughly. Pat dry. Spread them on a cookie sheet. Preferably, spray with olive oil. Tossing with olive oil is an option, but you may miss spots or use too much. Salt and pepper leaves lightly. Bake 7 minutes. Using tongs, turn the leaves over. Bake 7 more minutes or until crispy. Leaves crack and break clean when done.