In a small bowl, whisk together the olive oil, apple cider vinegar, and Dijon mustard to make a simple marinade. Set aside.
In another small bowl, combine the salt, pepper, garlic powder, and Italian seasoning.
Place the chicken breasts in a shallow dish. Pour the marinade over the chicken and rub the seasoning mixture on both sides evenly.
Preheat the air fryer if needed. Add the chicken breasts to the air fryer basket.
Cook at 375°F for 18–22 minutes, flipping once halfway through. Use a meat thermometer to ensure the internal temperature reaches 165°F. Cooking time may vary depending on the size of the chicken breasts.
Once cooked, remove the chicken from the air fryer and let it rest for 5–10 minutes before serving.