Cut away inner ribs from each kale leaf and discard, then tear the kale leaves into same-size pieces. Wash torn kale pieces and spin dry in a salad spinner or dry with paper towels until they're very dry.
Mix oil, vinegar and salt together in a small bowl then pour the mixture into a large Ziploc bag (or use a bowl if you don't mind getting your hands oily.)
Add the kale pieces to the bag and distribute the mixture evenly over the kale until all pieces are evenly coated. Arrange kale leaves in a single layer on a baking sheet.
Roast until they are mostly crisp, about 20-25 minutes and serve immediately.
Notes
These are great if you're craving something crispy, but they're not a dipable chip.