In a small bowl add olive oil/ melted butter and all the spices mentioned above.
Wash and clean the potatoes thoroughly.
Slice the potatoes in ¼ - ½ inch thick slices leaving half inch at the base.
Brush the potatoes with seasoned oil.
Preheat the air fryer at 360 F (180 C).
Place the potatoes in the basket and start the air fryer at the same temperature for 15 minutes till the potatoes are tender.
Then to make the skin crispier, set the air fryer for another 5 minutes at 390 F or 200 C.
In case you don't need crispy skins of the potatoes, you can extend the time to 20 minutes at 360 F (180 C) only.
Remove once done and serve hot.
You can additionally brush them with some more butter or garlic herbed butter (if not vegan).
Video
Notes
Expert tip - To get the best of the flavors infused into the air fryer Hasselback potatoes, apply the seasoning in half ways also. You can also flip the potatoes at 10 minutes to make sure all parts are cooked evenly. However, this is optional.