Place the meat in the air fryer basket. Depending on the size of your air fryer, you may have to cook in batches.
Put a small pat of butter on top of each piece.
2 tablespoons butter or olive oil
Air fry at 400 F for the following times, assuming the steak is 1 inch thick. Add about 1 minute to the times for each additional 1/2 inch of thickness.medium-rare: 5 min/sidemedium: 6 min/sidemedium-well: 7 min/sidewell-done: 8 min/side
Flip the steaks and air fry on the other side for the time given above.
Use an instant-read thermometer to verify that the meat has reached your desired temperature.
Allow it to rest for 5 minutes before serving.
Notes
Buy a tender, well-marbled piece of meat at least 1 inch thick. A thicker steak like ribeye, porterhouse, or NY strip will yield better results than a thinner one.
Add a little butter or olive oil on top to help the meat brown.
Verify the internal temperature with a meat thermometer, don't just rely on cooking time.
Let the steak rest for 5 minutes before serving. This makes it juicier and lets it finish cooking.