Preheat the air fryer to 400 degrees F (200°C) for 3-5 minutes to ensure it reaches the desired temperature. Season the chicken breasts: In a mixing bowl, combine the olive oil, minced garlic, chopped rosemary, lemon zest, salt, and black pepper. Mix well to create a marinade.
Place the chicken breasts in the marinade and toss them until they are well coated. Allow them to marinate for at least 15 minutes to allow the flavors to penetrate the meat.
Remove the chicken breasts from the marinade, shaking off any excess. Place them in a single layer in the air fryer basket, leaving space between each piece for optimal air circulation. Put the air fryer basket with the chicken breasts into the preheated air fryer. Cook the chicken breasts for about 12-15 minutes, flipping them halfway through the cooking time. For fully cooked chicken, the internal temperature should reach 165°F (74°C)
Once cooked, transfer the chicken breasts to a plate and let them rest for a few minutes. This helps the juices redistribute and ensures moist and tender chicken. Slice or serve the chicken breasts whole, garnished with additional fresh rosemary if desired.
Serve the Rosemary Chicken Breast as a main dish alongside your favorite sides like roasted vegetables, rice, or a fresh salad.