Preheat the air fryer to 350°F
Let the steak sit at room temperature for 10 to 15 minutes
Lightly brush the steak with oil or butter
Place the steak in the air fryer basket in a single layer
Reheat for 3 to 5 minutes
Flip halfway through
Check the internal temperature
Remove when warmed to your desired doneness
Rest for 2 to 3 minutes before serving