Place the chicken breasts in a resealable plastic bag or shallow dish.
Pour the Italian dressing over the chicken breasts, ensuring they are fully coated.
Seal the bag or cover the dish and marinate in the refrigerator for at least 10 minutes, or up to 2 hours for more flavor.
Preheat the air fryer to 375°F (190°C) for 3 minutes.
Remove the chicken breasts from the marinade and shake off any excess dressing.
Place the chicken breasts in the air fryer basket in a single layer, ensuring they do not overlap.
Cook the chicken breasts in the air fryer at 375°F (190°C) for 9 minutes.
Flip the chicken breasts and continue cooking for an additional 9 minutes, or until the internal temperature reaches 165°F (74°C) using a meat thermometer.
Remove the chicken breasts from the air fryer and let rest for 5 minutes before slicing and serving.