Prep the chicken: Pat the chicken dry with paper towels. Cutting into even 1-inch pieces helps it cook uniformly.
Coat for crispiness: In a bowl, mix cornstarch, baking powder, salt, and pepper.
Toss the chicken pieces until evenly coated. Shake off any excess.
Preheat the air fryer: Set to 400°F (200°C) for 3–4 minutes. A hot basket helps the coating crisp.
Arrange and spray: Lightly spray the basket with oil.
Place the chicken in a single layer with a little space between pieces. Spray the tops lightly with oil.
Air fry the chicken: Cook at 400°F for 10–14 minutes, flipping halfway. They’re done when golden and cooked through (165°F internal temperature).
Work in batches if needed.
Build the sauce: In a small bowl, whisk soy sauce, rice vinegar, hoisin, sugar, ketchup, Shaoxing wine (if using), and broth. In a separate cup, mix the 2 teaspoons cornstarch with 2 teaspoons water to make a slurry.
Sauté aromatics: In a skillet over medium heat, add a small splash of oil. Cook the garlic and ginger for 30–45 seconds until fragrant.
Thicken the sauce: Pour in the sauce base and bring to a simmer.
Stir in the cornstarch slurry and cook 1–2 minutes until glossy and thick enough to coat a spoon. Add chili garlic sauce and sesame oil to taste.
Toss it all together: Add the hot, crispy chicken to the skillet and toss until every piece is coated.
Finish and serve: Sprinkle with sesame seeds and green onions. Serve over rice with broccoli on the side, if you like.