Set up three bowls: one with ¼ cup cornstarch, one with 2 large eggs (beaten), and one with 1 ¾ cups plain breadcrumbs or panko.
Season the chicken breasts with 2 teaspoons lemon zest, 1/4 teaspoon red pepper flakes, salt and ground black pepper.
Coat each piece in cornstarch, then dip in the beaten egg, and finally coat thoroughly in breadcrumbs.
Preheat your air fryer to 400°F (200°C) °F.
Air fry the chicken: Lightly spray both sides of the breaded chicken with cooking spray or brush with a little oil. Place the chicken in the air fryer basket in a single layer.
Cook for 10–12 minutes, flipping halfway through, until golden brown and fully cooked (internal temp should reach 165°F). Air fry for an extra minute or two if needed for crispiness.
To Make the Lemon Sauce: In a small saucepan, heat 1 tablespoon vegetable oil over medium-high heat.
Add 1 teaspoon freshly grated ginger and stir-fry for 1 minute or until fragrant.
Pour in 2 tablespoons dry sherry or Shaoxing wine and let it bubble.
Add 1 cup hot vegetable/chicken stock and bring it to a simmer.
Stir in juice of 2 lemons, 2 tablespoons granulated sugar, salt, and 1 tablespoon low-sodium soy sauce.
Add 2 tablespoons cornstarch mixed with 4 tablespoons cold water and stir until the sauce thickens, about 1–2 minutes.