I think I have figured it out!  Perfect Kale chips!  We love them, and even my kids (especially Rachel who is 1), eats them up!

Ingredients
1 bunch kale (or bagged, chopped kale)
1-2 Tbsp olive or grapeseed oil
sea salt, for sprinkling

  1. Preheat oven to 275 degrees.
  2. Chop kale to 1-1 1/2 inch pieces.
  3. Toss with oil and salt.  Use less than you would think of salt, the kale really shrinks while cooking and intensifies the flavor.
  4. Line baking sheet with parchment paper (easy cleanup).
  5. Bake for 20-25 minutes until reaches your desired crispiness (cooked through, slight brown on edges).  And stir halfway through.

Last time I made this I cooked them, and then after they were done just turned off the oven and they stayed warm as I finished dinner.