Place one potato on a cutting board. Make 10 thin, evenly spaced crosswise cuts across the potato (no larger than 1/4 inch apart), cutting no more than 3/4 of the way through so the bottom stays intact. Repeat with the remaining potatoes.
Arrange the potatoes in a single layer in the air fryer basket with the cuts facing up, making sure not to overcrowd the basket (work in batches if necessary).
Spray the potatoes evenly with olive oil spray.
Sprinkle the potatoes evenly with the 2 teaspoons kosher salt.
Air fry at 400°F for 10–12 minutes, or until the potatoes are crisp and golden brown (check at 10 minutes and add time if needed).
Let the potatoes cool slightly, then serve warm — or store in an airtight container in the refrigerator for up to two days.
Notes
I’m using baby golden potatoes but fingerling or baby red potatoes will also work.
Olive oil spray helps the potatoes crisp in the air fryer.