Slice russet potatoes into fries using a sharp knife or mandoline.
Soak fries in cold water for at least 30 minutes, then drain and pat dry.
Preheat air fryer to 375°F.
Toss fries with olive oil, salt, pepper, and any extra seasonings.
Spread fries in a single layer in the air fryer basket.
Air fry for 13 to 15 minutes, shaking the basket halfway through.
Check for a crispy texture. If needed, cook 2 to 3 minutes longer.
Serve immediately with your favorite dipping sauce.
Notes
For extra crispiness, soak fries for up to an hour. Avoid overcrowding the air fryer basket. Keep cooked fries warm in a 200°F oven while making additional batches.