For the marinade, whisk together the dark soy sauce, Shaoxing wine, and cornstarch together in a large bowl.
Pat the steak strips dry with paper towels. Squeeze them of excess moisture. Add them to the bowl and massage the marinade into the meat. Marinate for at least 10 minutes, or overnight for more flavor penetration.
Cook the noodles per packaging instructions. Drain and set into a large bowl with a bit of oil to keep moist.
Whisk together the dark soy sauce, light soy sauce, oyster sauce, and beef broth. Set aside for now.
Heat the oil in a wok or large pan over medium high heat. Swirl to coat the pan.
Add the onion and quickly stir fry for 1 minute.
Add the beef, garlic, and scallions. Quickly stir fry for 1 minute, or until the beef is cooked through to your liking.
Stir in the noodles and reserved sauce. Mix well and cook for 1-2 minutes to warm though.
Serve garnished with bean sprouts.