Wash and peel potatoes if desired. Slice the potato into 1/2" thick slices. Stack the slices and slice down to make 1/2" thick fries. See post photos for detailed steps.
Transfer fries to a bowl with cold water and soak 30 minutes minimum, but up to 4 hours is fine. Preheat the oven to 375 before the soaking process is over.
Drain potatoes, rinse again and transfer fries to a towel or paper towels and dry thoroughly.
Place the potatoes on a parchment paper lined cookie sheet. Drizzle with the oil, salt and pepper or other spices if using. Toss well and spread the potatoes out in a single layer. Use two cookie sheets if needed.
Bake on the center rack at 375 for 20 minutes, then turn the oven up to 425 and bake an additional 15-20 minutes depending on the size of your fries. Very thin ones will take about 15, and thicker could take closer to 25. Toss the fries twice to ensure even browning.