Toss the sliced beef with cornstarch, one tablespoon of soy sauce, and the Chinese cooking wine. Set aside for 10 minutes while preparing the vegetables and sauce.
Mix the remaining soy sauce with the oyster sauce and two tablespoons of water. Keep the sauce beside the stove.
Heat a large wok or skillet over high heat. Add half the oil, stir-fry the beef in a single layer until browned at the edges and just cooked, then transfer it to a plate.
Add the remaining oil. Stir-fry the garlic and onion briefly, then add the cabbage, bean sprouts, and carrot. Cook until the vegetables are bright and just tender.
Add the cooked noodles, beef, and sauce. Toss over high heat until the noodles are hot, glossy, and evenly coated. Finish with the green onions and serve immediately.
Notes
Model-authored fallback: the source page was validated as a single recipe and supplied the dish identity and featured image; quantities and method are a coherent conventional recipe.