Place sliced beef, carrots, and green onions into a plastic zip-top bag. Add, soy sauce, brown sugar, sesame oil, sesame seeds, garlic, and ground pepper. Squish the bag well to get the meat and sauce to incorporate well.
Place the meat and veggies into the air fryer basket, leaving behind as much of the marinade as you can. Set air fryer to 400°F for 12 minutes, shaking halfway through.