Preheat oven to 450 degrees.
In a large bowl, lightly coat potato slices with olive oil and add chili powder, cayenne, salt and pepper. Mix until slices are fully coated in seasonings and olive oil.
Line a cookie sheet with parchment paper. Arrange potato slices in a single layer on prepared cookie sheet. Bake for 30-35 minutes, or until slices start to crisp and brown on the edges. Take out of oven and cool completely.