Preheat your air-fryer to 400°F.
Pat the chicken breast dry and cut it into bite-sized pieces or strips for even cooking.
In a shallow bowl, combine the cornstarch and lightly season with a pinch of salt and pepper. In another small bowl, whisk the egg white.
Dip the chicken pieces first in the egg white, then coat them in panko bread crumbs to form a light crispy layer.
Place the coated chicken pieces in the air-fryer basket in a single layer and cook for 8-10 minutes, flipping halfway through, until golden and cooked through.
While the chicken is cooking, prepare the orange sauce. In a small saucepan, combine the orange juice, minced garlic, minced ginger, and soy sauce. Heat gently over low-medium heat, stirring occasionally, until the sauce slightly thickens, about 3-4 minutes.
Steam or microwave the broccoli until bright green and tender, about 3-4 minutes if steaming.
If not pre-cooked, prepare brown rice according to package instructions, or reheat pre-cooked rice.
Once the chicken is done, transfer it to a large bowl and toss with the warm orange sauce to evenly coat each piece.
To serve, layer the brown rice and steamed broccoli in a bowl, then top with the crispy orange chicken. Optionally, garnish with a little extra orange zest for brightness.