Combine chicken, 2 tbsp soy sauce, Shaoxing wine and 1 tsp cornstarch; marinate 10–15 minutes.
Whisk together sauce ingredients: light soy, dark soy (if using), vinegar, hoisin or sugar, chili paste, sesame oil and chicken stock; set aside.
Heat a large wok or skillet over high heat; add 1 tbsp oil and swirl to coat.
Add marinated chicken in a single layer; sear without overcrowding, stir-fry until golden and nearly cooked, about 3–4 minutes; remove to a plate.
Add remaining oil to the wok; toss in dried chilies and stir until fragrant (30–40 seconds), taking care not to burn them.
Add garlic and ginger; stir 20–30 seconds until aromatic.
Return chicken to the wok; pour in the prepared sauce and bring to a simmer.
Stir in cornstarch slurry to thicken the sauce; cook until sauce is glossy and coats the chicken.
Toss in roasted peanuts and the white parts of the scallions; heat through for 30 seconds.
Remove from heat, garnish with green scallion slices and sesame seeds, and serve immediately over steamed rice.