Preheat oven to 400°F (200°C) or set the air fryer to 375°F (190°C).
Wash and slice the potatoes thinly, about 1/8 inch thick, using a mandoline or a sharp knife.
Soak the potato slices in cold water for 30 minutes to remove excess starch, then pat them dry with a clean towel.
Toss the potato slices in olive oil, ensuring they are evenly coated.
Spread the slices in a single layer on a baking sheet lined with parchment paper, or place them in the air fryer basket.
Sprinkle with sea salt, garlic powder, and paprika.
Bake for 25-30 minutes, flipping halfway through, or air fry for 15-20 minutes, until golden and crispy.
Garnish with fresh parsley, if desired, and serve immediately.
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