Preheat oven to 250°F.
Wash the Kale leaves and dry well. Cut each leaf in half lengthwise. Remove stem and center rib.
Toss kale with oil in large bowl.
Arrange leaves in single layer on 2 large baking sheets.
Combine Cinnamon and sugar in a bowl and sprinkle over Kale leaves.
Bake until crisp, about 25 - 30 minutes. Check after 25 minutes. Smaller leaves take less time and should be removed first. The larger more wrinkled leaves usually need to bake for a few extra minutes to get crisp.
Transfer leaves to rack to cool.