Select preset program of Preheat to preheat the air fryer.
Season steak with salt and pepper.
Spray crisper tray with olive oil cooking spray and place steak into the air fryer.
Set temperature to 400°F/200°C then press Start/Stop and cook for 10 to 15 minutes, flipping halfway through until desired doneness is reached.
Meanwhile, combine remaining ingredients in a medium bowl.
Slice steak and serve with herb sauce.
Tip: Chimichurri sauce can be stored in an airtight container for up to 2 days.