Let the steak come to room temperature before cooking. Brush the T-bone steak down with the olive oil on both sides, then sprinkle on salt and pepper as desired
Place the steak in the air fryer. Turn the air fryer on and cook at 400 degrees with full air circulation
Use a meat thermometer to check the steak regularly, starting at the 4-minute mark. Thinner steaks can reach medium rare within 4 to 5 minutes. Thicker steaks will take longer, but they can go from too rare to done in under a minute, so check often
Let the steak rest under a cover of aluminum foil for 2 to 3 minutes before eating