
Place each potato between two chopsticks. Slice crosswise every 1/8 inch, cutting down to the chopsticks (they prevent cutting all the way through).
Brush with olive oil, making sure it gets between the slices. Season with salt and pepper.
Air fry at 400°F for 30-35 minutes until the edges fan out and get crispy.
Mix melted butter with garlic and rosemary. Brush over potatoes, getting between the slices. Cook 5 more minutes.
Top with Parmesan and chives. Serve with sour cream.
Tip: The chopstick trick is essential — it prevents you from cutting all the way through. Thinner, more uniform slices create better fans and crispier edges.
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