- Toss the chicken pieces in cornstarch until coated. Shake off any excess. 
- In a large skillet or wok, heat vegetable oil over medium-high heat. Add the chicken and cook until golden and crispy on all sides. Remove and set aside. 
- In the same pan, add garlic, ginger, and red chili flakes. Sauté for 30 seconds until fragrant. 
- In a bowl, whisk together soy sauce, hoisin sauce, rice vinegar, brown sugar, sesame oil, and chicken broth. 
- Pour the sauce into the pan and bring to a simmer. Let it reduce slightly. 
- Return the cooked chicken to the pan and toss to coat in the sauce. Let it cook for another 2–3 minutes until everything is glossy and thick. 
- Serve hot over steamed rice, garnished with chopped green onions and sesame seeds.