Use a mandoline to cut sweet potato into ⅛-inch thick slices.
Arrange slices on a wire baking rack (if you have one) on top of a parchment-lined baking sheet.
Spray slices with cooking spray and season to taste. If desired, flip slices to spray and season on the other side.
Bake 12-20 minutes*, flipping your slices halfway if not using a baking rack.
*Cook time may vary! It will depend on your oven, the thickness of your slices, and the moisture/starchiness of your sweet potatoes. When ready, potato slices will be curling around the edges and starting to brown. Don’t be afraid of letting them brown a bit if you want truly CRISPY oven baked sweet potato chips!
Sprinkle with salt when out of the oven if desired.