Preheat oven to 250. Chop kale into chip size pieces. Arrange kale pieces on a sheet tray in a single layer, this is vital if you want all the kale to get crispy. Drizzle olive oil and sea salt atop the kale and roast in the oven for half an hour. Enjoy.
P.S. All types of kale work for this, but I've found lacinato (also known as Tuscan, Black or Dinosaur(?)) kale to have the best texture and flavor