I call them Planks it sounds better than Big Fat Fries. I saw a recipe for something like them years ago and I changed the recipe around and made it easier.
Oven is at 450°
I clean raw Potatoes and leave skin on. I cut it in half lengthwise, then I cut each half 3 times lengthwise. I put oil on a cookie pan (with sides) and I rub the thick (planks) slices of Potatoes in the oil. (Both sides) Then I sprinkle Onion Powder, Garlic Powder & Paprika on the top side. After 10 minutes or so I turn the planks over and season the other side and repeat. Cook the Planks until they are tender. Don't over cook they'll get REALLY hard.
Sometimes I cook a Steak or Pork Chops in the same pan while the Planks are cooking.