Preheat an oven to 425°F (218°C). While the oven is preheating, place chopsticks along each side of the potato. Slice the potato into ⅛ inch thick slices being careful not to go all of the way through the potato.
Brush the potato with olive oil and season with kosher salt and pepper. Place the potato onto a wire rack lined baking tray and place into the oven.
Cook the potatoes for 45-60 minutes. Remove the potato from the oven after the initial cook, then brush again with olive oil and go back into the oven for an additional 10-15 minutes. The exterior should be crispy, and inside should be fork tender.
Remove the potatoes from the oven, and using a hand lightly fan the potatoes. Finish with flakey salt.