Wash the kale leaves, cut out the thick stems in the middle and break them into smaller pieces. Dry well. Coat them with a small amount of olive oil, a pinch of salt and any other spices you like, cumin, coriander, turmeric, cayenne, etc or just have them plain. Place on baking sheets and dry in a low oven or dehydrator. The normal temperature to dry things in a dehydrator and retain all the nutrients is approximately 50 degrees C or 120 degrees F, but most people do not own one, so it’s also okay to put them in the oven at a slightly higher temperature for less time. When using an oven at 95 degrees Celsius or 200 degrees F, they will dry in about 20 minutes.