Peel the potatoes and cut in half and then half again.
Cut into even thin pieces. The more evenly thick you can cut them, the more even they will bake.
Put them in a bowl of ice water and let them soak for about 20 minutes. This helps remove starch and make them more crispy. You don't have to soak them, you can just give them a good rinse if you don't have time.
Rinse well and then thoroughly pat them dry with paper towel. Make sure you get as much water off as you can.
Next put them in a ziploc bag with 1-2 tsp of oil and shake to coat.
Line a baking sheet with foil, and place a cooling rack on top of it. Lay the potatoes on the cooling rack so that they are not touching. Sprinkle with salt.
Bake at 450 degrees F for 30 minutes or until golden brown and crispy.