Coat the pork loin with oil and then, season with parsley, salt, and black pepper.
In a large bowl, add the potatoes, remaining oil, garlic powder, red pepper flakes, salt, and black pepper and toss to coat well.
Grease the Air Fryer Basket with cooking spray and then slide inside.
Adjust the temperature of Air Fryer to 325 °F to preheat for 5 minutes.
After preheating, arrange the pork loin into the greased Air Fryer Basket.
Arrange potato pieces around the pork loin.
Slide the basket into Air Fryer and set the time for 25-30 minutes.
After cooking time is finished, remove the pork loin from Air Fryer and place onto a platter for about 5-10 minutes before slicing.
Cut the pork loin into desired-sized slices and serve alongside the potatoes.