Rinse and thoroughly pat dry the steak cubes. Combine the steak cubes and mushrooms. Coat with the melted butter and then season with Worcestershire sauce, optional garlic powder, and a generous seasoning of salt and pepper.
Preheat the Air Fryer at 400°F/205°C for 4 minutes.
Spread the steak and mushrooms in an even layer in the air fryer basket. Don't overcrowd the basket/tray. Cook in batches if needed.
Air fry at 400°F/205°C for 6-8 minutes. Shake and flip the steak and mushrooms. Check to see how well done the steak is.
If you want the steak more done, add an extra 3-5 minutes of cooking time, or until cooked to your preference (time depends on your preferred doneness, thickness of the steak, size of air fryer).
Garnish with parsley and drizzle with optional melted butter and/or optional chili flakes. Season with additional salt & pepper if desired. Serve warm.
