Using a spiralizer, shave the potatoes into ribbons. Add them to a large bowl, along with the onion, 1 teaspoon salt and 1/2 teaspoon pepper. Toss well to combine.
Heat the oil in a large nonstick skillet over medium heat. Scoop the potato mixture into 4 piles (about 1/3 cup each). Flatten with a spatula and cook, rotating and pressing the hash browns down a few times, until the bottoms are golden brown, about 5 minutes. Carefully flip and cook until the bottoms are golden brown, about 5 minutes more. Slide onto a serving platter or place on a baking sheet lined with a cooling rack and keep warm in the oven at 200 degree F. Repeat with the remaining potato mixture, adding more oil if necessary.
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