Slice the chicken into thin strips. Mix it with Shaoxing wine, a pinch of salt, and cornstarch. Let it sit for about 10 minutes. This little trick keeps the chicken extra tender and gives it a smooth texture once cooked.
Chop the broccoli into bite-sized florets. Add a splash of water to your skillet, toss in the broccoli, and cover for under a minute. This quick steam locks in the bright green color and crunch. Remove and set aside.
Heat oil in the skillet and spread the marinated chicken evenly. Don’t stir right away—let it cook for about 30 seconds so it forms a nice crust. Flip and cook the other side until almost done.
Lower the heat slightly, then toss in the garlic and ginger. Stir for a few seconds until they release their fragrance. Be careful not to burn them, as they cook very fast.
In a small bowl, whisk together oyster sauce, dark soy sauce, chicken stock, sugar, and the cornstarch mixture. Pour it into the skillet, stir well, and let the sauce thicken. Add the broccoli back, coat everything evenly, and simmer for a minute before serving.