Preheat the oven to 350F. Wash kale and cut into two-inch pieces. (Try to make the pieces all the same size or they will not cook at the same rate.) Spray a baking sheet with oil and place the pieces of kale on it in a single layer. Spray lightly with oil, if desired, and sprinkle with salt.
Bake for 7 minutes. Turn the chips over and bake for 3-7 more minutes, until crispy and edges just beginning to brown. Cool and eat.