Combine cornstarch and water in a bowl. Add sliced chicken and toss until evenly coated. Set aside for 10 minutes.
Cook lo mein noodles according to package directions until just tender. Drain and rinse briefly with cold water to stop cooking.
Heat oil in a large wok or skillet over high heat. Add minced garlic and stir-fry for 30 seconds until fragrant.
Add marinated chicken to the wok and stir-fry for 3-4 minutes until cooked through and no longer pink.
Add shredded cabbage and julienned carrots to the wok. Stir-fry for 2-3 minutes until vegetables are tender-crisp.
Add Shaoxing wine, light soy sauce, dark soy sauce, oyster sauce, and season with salt, sugar, and white pepper to taste. Stir to combine.
Add cooked noodles, bean sprouts, and scallions to the wok. Toss everything together for 2-3 minutes until noodles are heated through and well coated with sauce.
Remove from heat, drizzle with sesame oil, and give one final toss. Serve immediately while hot.