Begin by scoring the skin of the duck breast about 2 cm apart. Be careful not to cut into the flesh. Season the skin with salt and the meat side with both salt and pepper.
Place the duck breast skin-side down in a cold pan. Turn the heat up high.
Let the duck cook for 6 minutes. As soon as it starts to sizzle, lower the heat to medium or just above. Collect the rendered fat in a bowl every couple of minutes.
Meanwhile, get your air fryer heating up.
After 6 minutes on the skin side, flip the duck breast and sear the flesh side for just 30 seconds.
Now move the duck breast, skin-side up, to your air fryer. Cook at 320°F (160 C) for 10 minutes.
Once done, let the duck rest for 5 minutes before serving. Slice it up or present it whole.