Preheat your air fryer to 400°F for about 5 minutes.
Slice the chicken breast into bite-sized pieces.
In a bowl, whisk together the egg white. In a separate shallow dish, combine panko breadcrumbs, cornstarch, garlic powder, and salt.
Dip each chicken piece in the egg white, then coat evenly with the breadcrumb mixture.
Place the coated chicken pieces in a single layer in the air fryer basket. Lightly spray with oil if desired for extra crispiness.
Air fry the chicken at 400°F for 10-12 minutes, shaking the basket halfway to ensure even cooking.
While the chicken cooks, prepare the orange sauce. Squeeze the juice from the medium orange into a small saucepan. Optionally, add a bit of zest for extra flavor. Warm the juice over medium heat to slightly reduce it, about 2-3 minutes.
Once the chicken is crispy and golden, remove from the air fryer and drizzle with the warm orange sauce.
Serve immediately and enjoy your crispy, tangy Orange Chicken.