Turn air fryer to 325 degrees. Add cut potatoes. Cook for 3 minutes, flip, and cook for 3 more minutes. Remove from air fryer. NOTE: This step is to help soften the inside of the fries before you add the coating.
In a large bowl whisk together buttermilk and egg.
In a second bowl, whisk together flour, cornstarch, seasoning salt, black pepper, garlic powder, onion powder, white pepper, and chili powder.
Working with a few potato pieces at at time, place the potato pieces in the buttermilk mixture so that pieces are entirely covered. Then remove potatoes from buttermilk mixture and shake off excess liquid.
Roll potato in flour mixture until well coated.
Place coated potatoes into air fryer basket.
Spray all sides of coated potatoes with spray oil. Make sure that all of the flour mixture has been sprayed and no areas appear dry.
Turn air fryer to 375 degrees. Cook for 8 minutes, remove, and flip potatoes. If you see any dry spots, spray them with oil again. Return to air fryer and cook for an additional 8-10 minutes, or until potatoes appear browned and crunchy.