Heat the air fryer to 375°F for at least 10 minutes. Meanwhile, rinse, scrub, and dry 2 medium russet potatoes. Use a fork to prick the potatoes in a few places. Drizzle the potatoes with 1 teaspoon neutral oil and rub with your hands to coat the potatoes. Season the potatoes with 1/2 teaspoon kosher salt.
Place the potatoes in the preheated air fryer. Roast until the potatoes can be easily pierced with a paring knife, about 40 minutes. Remove the potatoes from the air fryer with tongs, then cut each one lengthwise to split. Serve with butter, salt, and pepper, or as desired.