Preheat the air fryer to 380°F (193°C) for about 5 minutes.
While the air fryer is preheating, pat the chicken breasts dry with paper towels to remove excess moisture.
In a mixing bowl, combine the olive oil, garlic powder, onion powder, smoked paprika, salt, black pepper, and dried thyme (if using).
Coat each chicken breast evenly with the marinade mixture, ensuring all sides are covered.
Once the air fryer is preheated, place the chicken breasts in the fryer basket in a single layer, making sure they are not touching.
Cook the chicken breasts for 10 minutes before flipping them over using tongs.
Continue cooking for another 8-10 minutes, or until the internal temperature reaches 165°F (74°C). Use a meat thermometer for accuracy.
Once cooked, remove the chicken breasts from the air fryer and let them rest for 5 minutes before slicing or serving.
For added flavor, optionally marinate the chicken breasts in the seasoning mixture for 30 minutes to 2 hours before cooking.
Serve with fresh vegetables, a salad, or your choice of side dish for a complete meal.