Mix the chicken into the egg until fully coated before mixing in the corn starch until just evenly coated.
Heat the oil in a pan over medium-high heat, add the chicken, separate, and cook until golden brown, about 2-4 minutes per side, before setting aside, reserving the leftover oil in the pan.
Meanwhile, mix the broth, sugar, dark soy sauce, light soy sauce, ketchup, vinegar, chili sauce and cornstarch and set aside.
Add the dried red chilies, garlic and ginger to the pan and cook in the remaining oil until fragrant, about a minute.
Add the sauce mixture to the pan, bring it to a boil and simmer until it thickens a bit, about a minute.
Add the chicken, toss to coat, remove from heat, mix in the sesame oil, sesame seeds and green onions and enjoy over rice or noodles.