01 - Cook noodles according to package directions. Drain and rinse with cold water to stop cooking. Set aside.
02 - Whisk together soy sauce, oyster sauce, hoisin sauce, brown sugar, sesame oil, red pepper flakes, and water in a small bowl until sugar dissolves.
03 - Heat a large skillet or wok over medium-high heat. Add ground beef and cook, breaking apart with a spoon, until browned completely, about 5 to 6 minutes. Drain excess fat if needed.
04 - Stir in garlic and ginger. Sauté for 1 minute until fragrant, being careful not to burn the garlic.
05 - Add carrot, bell pepper, and cabbage to the skillet. Stir-fry for 3 to 4 minutes until vegetables begin to soften but still retain some crunch.
06 - Pour the prepared sauce over the beef and vegetables. Stir well to combine and let simmer for 2 minutes until slightly thickened.
07 - Add cooked noodles to the skillet. Toss everything together thoroughly until noodles are evenly coated with sauce and heated through.
08 - Remove from heat. Sprinkle with sesame seeds and fresh cilantro or additional green onions. Serve immediately while hot.