Preheat oven to 400 degrees. Cover large baking sheet with parchment paper.
Put potato slices in a large bowl. Spray with vegetable spray. Add salt, pepper and cayenne pepper. Use hands to gently toss potato slices to cover with oil and spices.
Place potato slices on parchment lined baking sheet. Make sure to leave space between potato slices. Bake for 15 minutes and then rotate sheet. Bake for another 15 minutes. Potatoes are done when they’re crisp and golden. Watch carefully as the potatoes might be finished sooner.