Preheat the air fryer to 375°F (190°C) for about 5 minutes.
In a mixing bowl, combine olive oil, garlic powder, onion powder, paprika, oregano, salt, and black pepper. Stir until well mixed.
Pat the chicken breasts dry with paper towels to achieve a nice crust.
Coat each chicken breast evenly with the spice mixture, ensuring all sides are covered.
Place the seasoned chicken breasts in the air fryer basket in a single layer with space in between each piece.
Cook the chicken breasts in the air fryer at 375°F (190°C) for 18 minutes, flipping them halfway through the cooking time.
Check the internal temperature of the chicken using a meat thermometer. It should reach 165°F (74°C). If needed, continue cooking for an additional 1-3 minutes.
Once cooked, remove the chicken from the air fryer and let it rest for 5 minutes to keep the juices intact.
Slice the chicken breasts and serve warm, garnishing with fresh parsley if desired.