Preheat air fryer to 400°F (200°C) for 3–5 minutes
Pat steak dry with paper towels
Season both sides with salt and pepper (add garlic powder, smoked paprika, or steak seasoning if desired)
Lightly coat steak with oil (or oil the basket)
Place steak in a single layer in the basket, leaving space around it
Air fry at 400°F (200°C) for 6–10 minutes total, flipping halfway
Check doneness using a meat thermometer:
Rare: 120–125°F (49–52°C)
Medium-rare: 130–135°F (54–57°C)
Medium: 140–145°F (60–63°C)
Medium-well: 150–155°F (66–68°C)
Well-done: 160°F (71°C)
Remove steak when it’s 5°F (3°C) below target temperature
Rest steak 5 minutes before slicing
For extra crust: air fry 1–2 minutes longer at 425°F (218°C) if needed