Preheat your oven to 400 degrees.

Wash and scrub your potatoes, and leave the skin on.

Cut each potato into thin slices about 1/4 inch apart, and 3/4 of the way through to the bottom of the potato, making sure you don't cut through the bottom of the potato. (You want the bottom of the potato to remain intact.) Also, if you want to cut the slices even thinner, feel free to do so - I like them this way because the slices get more crunchy the thinner they are.

Drizzle the potatoes with the butter or oil, making sure that some of the oil gets down into the slices.

Sprinkle generously with salt and pepper, and herbs if you are using them.

Bake for 50 - 60 minutes. They can be baked for up to 2 hours depending on how crunchy you want them.