Preheat air fryer to 400 degrees F according to manufacturer directions if required.
Wash and dry potatoes thoroughly.
Rub all over with oil and season well with salt and pepper.
Place in the basket of the air fryer, place the basket into the air fryer and cook for 40 minutes (a little less if your potatoes are smaller than mine, a little more if your potatoes are larger than mine).
Check doneness be inserting a knife into the center of the potatoes -- if it goes in and comes out easily, they are done. If it seems to get stuck, give them 5-10 more minutes.