Bring a pot of water to a boil and blanch the string beans for 2–3 minutes. Immediately transfer to ice water to stop cooking and preserve color. Drain and set aside.
Heat vegetable oil in wok or pan over medium heat. Add ground chicken and cook 5–7 minutes, breaking it up until browned.
Reduce heat to low and stir in garlic, ginger, and bird’s eye peppers. Cook for 3 minutes to release flavors.
Stir in hoisin sauce, dark soy sauce, sesame oil, and cooking wine. Cook another 2–3 minutes until sauce is fragrant.
Increase heat to medium-high, add blanched beans, and toss thoroughly. Season with salt and cook for 4–5 minutes, until beans are crisp-tender and coated.