Wash the kale and dry very thoroughly (otherwise the flavorings will not coat the leaves well). Remove the thick parts of the stem from the kale leaves and tear the leaves into large pieces in a big bowl.
In a small bowl or cup, mix together the oil, flaxseed powder, and sea salt. Pour this mixture into the kale bowl.
Using clean hands, massage the oil mixture into the kale, squeezing and tossing the vegetables as you go to help soften the leaves. Mix for about 2 minutes until leaves are evenly coated. Taste and adjust salt if needed. Proceed with your method of choice below.
Dehydrator Method (preferred): Warm the dehydrator to 115 degrees F. Spread out the kale onto 4 perforated dehydrator sheets and dehydrate for 10-12 hours, or until crispy (time may vary depending on local humidity). When done, store in an air-tight, sealed container.
Oven Method: Heat the overn to 200 degrees F. Spread the kale out as flatly as possible onto a couple of baking sheets lined with parchment paper. Bake for 55-80 minutes, or until kale has dried out and is crispy. Keep a close eye on the kale at the end of its cooking process to make sure it does not burn. Let cool and store in an air-tight, sealed container.