Preheat oven to 425°F (220°C)
Wash and peel potatoes if desired
Cut potatoes into thin fries
Soak fries in cold water for 30 minutes
Drain and dry fries thoroughly
Toss fries with oil, salt, and pepper
Spread fries in a single layer on a baking sheet
Bake for 20 to 30 minutes, flipping halfway
Remove fries when golden and crisp
Toss hot fries with truffle oil
Add grated Parmesan cheese
Sprinkle with chopped parsley
Serve immediately