Velvet the Chicken: Combine chicken, egg white, cornstarch, baking soda, and salt in a bowl. Massage well and let sit for 30 minutes.
Prepare the Sauce: Mix light soy sauce, oyster sauce, hoisin sauce, ketchup, sugar, MSG, cornstarch, toasted sesame oil, and grated garlic in a bowl.
Blanch the Broccoli: Blanch broccoli in boiling water for a few minutes until tender but still crisp. Drain and set aside.
Velvet the Chicken: Blanch the marinated chicken in boiling water for 30-45 seconds until just cooked. Drain and set aside.
Stir Fry: Heat a wok over high heat and add neutral oil. Add chicken and broccoli, stir fry for about 1 minute.
Add Sauce: Pour the prepared sauce around the edges of the wok, allowing it to reduce and coat the chicken and broccoli.
Serve: Plate the stir fry and serve immediately with white rice.