Dip each chicken thigh into the flour and coat well. (Note - I state 1 cup, start with 1 cup and add more as needed so you don't waste the flour.)
Spray the basket of an air fryer with non-stick cooking spray or olive oil spray.
Place chicken in the basket.
Cook for 10 minutes at 390 degrees.
Turn the chicken and cook for an additional 10 minutes or until the internal temperature reaches at least 165 degrees.
Notes
Remember that all air fryers heat differently, so be sure the internal temperature is reached before serving.I also mention 1 cup of flour for the chicken thighs, you may need a little bit more depending on how large the chicken thighs are. I recommend starting with 1 cup and then adding more if needed, so you don't waste any of that flour.