Preheat the Air Fryer: Set your air fryer to 400°F.
Season the Steak: Bring the steaks to room temperature. Pat them dry with a paper towel, then rub both sides with olive oil. Combine Italian seasoning, onion salt, and crushed chili pepper in a small bowl and rub the mixture onto the steaks. You can allow the steak to marinate for about 15 - 30 minutes for extra flavor.
Cook: Brush the air fryer basket with little oil. Place the seasoned steaks in the air fryer basket. Cook for 12 minutes, turning once halfway through, for a perfect medium steak.
Make Garlic Herb Butter: While the steak cooks, mix softened butter with minced garlic, rosemary, thyme, and parsley in a small bowl.
Rest and Serve: Remove the steaks from the air fryer and let them rest for 5-10 minutes. This step is crucial for locking in the juices. Top each steak with a pat of the prepared garlic herb butter before serving.