Toss steak pieces with olive oil in a bowl.
In a small bowl, mix brown sugar, salt, pepper, chili powder, garlic powder, and onion powder.
Coat steak evenly with the seasoning mixture.
Preheat air fryer to 400°F (200°C) for 5 minutes.
Place steak bites in a single layer in the air fryer basket.
Cook for 4–6 minutes, depending on desired doneness.
Meanwhile, melt butter and mix with garlic powder, red pepper flakes, and parsley.
Remove steak bites and toss in garlic butter before serving.
These air fryer steak bites are best served hot and fresh for maximum flavor.