Onto a shallow bowl, place the roasting beef, avocado oil, salt, smoked paprika, garlic powder, dried oregano and steak seasoning.
Rotate the roasting beef with tongs to coat in the seasoinng until well incorporated. Pierce the roasting beef with a sharpe knife and massage the marinade into the beef.
Transfer roasting beef to the air fryer basket. Air fry for 30-40 minutes, or until roast is cooked through. 30 minutes will preduce a medium rare beef.
Garnish with butter and fresh rosemary leaves and serve immediately.