Prepare the beef: In a large bowl, combine ground beef, soy sauce, oyster sauce, rice wine (if using), brown sugar, minced garlic, ginger, pepper, and red pepper flakes (if using). Mix well and set aside to marinate for at least 15 minutes.
Cook the noodles: Cook the noodles according to package directions. Drain and set aside.
Cook the beef: Heat vegetable oil in a large skillet or wok over medium-high heat. Add the marinated beef and cook, breaking it up with a spoon, until browned and cooked through. Drain off any excess grease.
Combine noodles and beef: Add the cooked noodles to the skillet with the beef. Toss to combine.
Add garlic: Add the minced garlic to the skillet and stir-fry for about 30 seconds until fragrant.
Serve: Garnish with sliced green onions and serve immediately. You can drizzle with sesame oil for extra flavor.
