Spray a large pan with cooking spray and add onions, saute for 2 minutes add green chilies and saute for one more minute. Add flour, salt, cumin, and garlic powder and give it a quick stir or two, add salsa and continue stirring. Add in chicken and juices (if you do not have very many juices from your chicken add a little chicken broth), continue cooking for 5 minutes or until mixture thickens. Take off of heat and begin preparing chimichangas by filling tortillas. The Tortillas will bend easier if you warm them a little bit in the microwave. I just leave them in the package and put them in for 30-45 seconds. Fill the tortillas with about a half cup of the chicken and roll them up into a burrito. I fold in the 2 sides first and then roll it up. Set your air fryer to 400 degrees and place the chimchanga in the basket. Spray the chimichanga with some cooking spray and set the timer for 8 minutes. Serve with rice or beans.