Hey there, I'll keep it short and sweet. These potatoes are called Hasselback after their origination in a Swedish hotel.
You can get more elaborate, but olive oil, salt and russets are perfect just like this. Part of our roast chicken Sunday night dinner…and not a potato was left over.
Peel and cut potatoes in half lengthwise. Use chopsticks to avoid cutting through the potatoes when you're making the “fans”.
I roasted in a 375 convection oven.
More delicious crunch per bite – B
Btw – There's a difference between potatoes & fries…potatoes are good for you, even better with the skin.