01 - Combine chicken with soy sauce, Shaoxing wine, cornstarch, and black pepper in a bowl. Mix thoroughly and let marinate for 15 minutes.
02 - Whisk together all sauce ingredients (black vinegar, light soy sauce, sugar, cornstarch, water, and sesame oil) in a separate bowl until well combined. Set aside.
03 - Heat 1½ tbsp oil in a large skillet or wok over medium-high heat. Add eggplant cubes and stir-fry until golden brown and tender, approximately 5–7 minutes. Transfer to a plate and reserve.
04 - Add remaining oil to the skillet. Add marinated chicken pieces and stir-fry until browned on all sides and nearly cooked through, about 4–5 minutes.
05 - Add minced garlic, ginger, and white parts of the scallions to the skillet. Stir-fry for 1 minute until fragrant, being careful not to burn the garlic.
06 - Add red and yellow bell pepper pieces to the wok. Cook for 2–3 minutes until slightly tender but still crisp-tender.
07 - Return the cooked eggplant to the wok. Stir everything together to distribute evenly.
08 - Pour the prepared sauce over the ingredients. Stir-fry for 2–3 minutes until the sauce thickens and coats everything evenly.
09 - Sprinkle with the green parts of the scallions. Serve immediately over steamed jasmine or brown rice.