Pat wings dry and brush them in Nashville Hot Spice Mustard. Spray air fryer basket with cooking spray and place the wings in the basket so that they are not touching. If they touch that part will not get crispy and may stick to the other piece. Cook at 390 degrees F for 9 minutes, then flip the wings and add more Nashville Hot Spice Mustard if it needs more. Cook for another 9 more minutes. To get them extra crispy flip them again and raise the temp to 400 degrees F and cook for 1-3 more minutes until you get your desired crispiness. Smaller wings take less time than larger ones.