Scrub the potatoes and carrots, and cube them up. Cut the onion in half, then into 1/2” slices. Rinse the kale, then cut it into 1” ribbons.
Preheat your oven to 400°. Place everything but the kale on the sheet pan. Drizzle with olive oil and sprinkle with your favorite seasoning. Bake for 20 minutes.
Sprinkle kale on top, and bake for another 5 minutes.