Peel the parsnips (like you would a peeler), and using a mandoline, cut them into ¼ inch thick slices.
Toss the parsnip slices with the olive oil, arrange on a flat baking sheet, and sprinkle with salt and pepper.
Roast for 30 minutes, turning them/stirring them after 15 minutes or so to ensure even browning. Start checking after 20 minutes to see if they're the right color/texture.
Recipe by The Domestic Front at http://www.thedomesticfront.com/roast-parsnips/