Chinese Sweet and Spicy Chicken

Name: Chinese Sweet and Spicy Chicken
Cuisine: Asian, Chinese
Ingredients: 500g chicken thighs or breasts, cut into bite-sized pieces; 1/2 cup corn starch (for coating the chicken); 1 egg, beaten; Vegetable oil (for frying); 1 tbsp light soy sauce; 1 tbsp Shaoxing wine (or dry sherry); 1 tsp sesame oil; 1/2 tsp salt; 2 tbsp light soy sauce; 1 tbsp dark soy sauce; 3 tbsp rice vinegar; 2 tbsp hoisin sauce; 3 tbsp sugar; 1 tbsp corn starch mixed with 2 tbsp water (for thickening); 1/2 cup chicken broth; 1 tsp chili flakes (adjust to taste); 3 cloves garlic, minced; 1-inch piece ginger, minced; 3–4 dried red chilies (optional, for extra heat); 2 tbsp vegetable oil; Sliced green onions; Sesame seeds