In a large bowl, combine the steak cubes with olive oil, garlic powder, salt, and pepper. Ensure each seasoned steak bites is well-coated.

Preheat the Air Fryer: Preheat your air fryer to 400 degrees F for about 3 minutes. This ensures a high temperature that will sear the steak bites quickly.

Air Fry the Steak: Place the steak bites in the air fryer basket in a single layer, ensuring they don’t overlap for even cooking. Depending on the size of your air fryer, you may need to cook them in batches.

Cooking Time: Air fry the steak bites for 5 minutes, shake the basket. Cook for another about 4-5 minutes for medium doneness. The internal temperature should reach 145 degrees F for medium doneness; adjust the time slightly for rarer or more well-done steak bites.

Make the Garlic Butter Sauce (optional): While the steak bites are cooking, mix melted butter with minced garlic and fresh parsley in a small bowl. Drizzle this sauce over the cooked steak bites for an extra burst of flavor.

Serve: Enjoy your steak bites hot from the air fryer, garnished with additional parsley or green onions if desired.