Wash and thoroughly dry the kale.
Preheat the oven to 325°F and line 2 baking sheets with parchment paper.
Remove the ribs from the kale and discard.
Toss the kale with the olive oil, salt, and pepper in a large bowl then lay flat on the prepared baking sheets so that the leaves aren't overlapping.
Bake in the oven for 15 minutes, rotating the pans halfway through.