Season the chicken with the soy sauce, oyster sauce, black pepper and cornstarch; toss to coat.
Mix the sauce: stir together the chicken stock, soy sauce, dark soy sauce and honey.
Heat the oil in a pan over medium-high and pan-fry the chicken 3-4 minutes until golden; remove and set aside.
Add the sliced onion to the same pan and saute 2-3 minutes until softened.
Pour in the sauce, return the chicken, and simmer 4-5 minutes until glossy.
Reduce the heat, drizzle the beaten eggs over the top, and cook about 2 minutes until just set and silky.
Spoon over steamed rice and top with green onion and sesame seeds.
Tiffy Cooks' 20-minute weeknight chicken-and-egg rice bowl (oyakodon-style), saved from her Instagram reel. Method from the video; the full recipe card lives at tiffycooks.com.