Preheat oven to 425F. Cut potato crosswise, not quite all the way through, starting from one end of the potato, at about 3-4 mm intervals. Arrange potatoes on a baking tray. Drizzle the olive oil and sprinkle some sea salt and freshly ground black pepper. Top with a sprinkle of Parmesan cheese. Bake potatoes for about 40 minutes or until potatoes turn crispy and flesh is soft.