In a shallow bowl, mix together the flour, Cajun seasoning, and salt.
In another bowl, crack the egg and beat well.
Coat each chicken thigh with the flour mixture, then dip into beaten egg and finally, coat with the flour mixture again.
Shake off the excess flour thoroughly.
Grease the Air Fryer Basket with cooking spray and then slide inside.
Adjust the temperature of Air Fryer to 390 °F to preheat for 5 minutes.
After preheating, arrange the chicken thighs into the greased Air Fryer Basket, skin side down in a single layer.
Slide the basket into Air Fryer and set the time for 5 minutes.
After15 minutes of cooking, flip the chicken thighs.
After cooking time is finished, remove the chicken thighs from Air Fryer and serve.