Various spices (I love cayenne and cracked black pepper, a little crushed red pepper)
See Below for Other Ideas!
THE METHOD (preheat oven to 400)
Slice your plantain thinly (I use an egg slicer), toss in coconut oil and spices. Put on parchment, silicone or Silpat. Bake for 20 minutes, turn over, cook for 20-25 more minutes.
Links to great ways to use Plantain chips:
Sprinkled with Gingerbread Spice Mix
Sprinkled with Pumpkin Spice Mix