Slice parsnips about 1/8-inch thick. You'll want each of the slices to be the same thickness. I like to use my slicing attachment on my food processor to do this.
Place sliced parsnips in a large bowl.
Drizzle olive oil over slices and toss to coat evenly.
Sprinkle on salt and pepper then toss again.
Lay slices in a single layer on two baking sheets lined with a silicone mat. Do not overlap.
Bake for 15 minutes then remove the pan from the oven and flip the slices over.
Continue to bake for another 15 minutes then check every 5 minutes to see if they are done.
Edges will curl and the center will be firm, not soft.
Remove from the oven.
Let the chips cool before serving.
Notes
Total baking time will vary depending on the thickness and diameter of your parsnip. Slices smaller in diameter may finish sooner than the larger slices.