Preheat oven to 375 F.

Rinse the kale, and tear leafy parts away from the stems. Roughly chop into smaller pieces, and lay down amongst two baking sheets.

Whisk together olive oil, vinegar, salt, and pepper in a small bowl, then distribute between both sheet pans of kale. Toss kale with sauce, and bake for 4-5 minutes or until wilted and crunchy, but still green.