01 - Cook noodles according to package directions. Drain and rinse with cold water to stop cooking. Set aside for later assembly.
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 completely.
03 - Heat a large skillet or wok over medium-high heat. Add ground beef and cook, breaking apart with a spatula, for 5 to 6 minutes until browned and fully cooked. Drain excess fat if needed.
04 - Stir in minced garlic and grated ginger. Sauté for 1 minute until fragrant, being careful not to burn the garlic.
05 - Add julienned carrot, sliced bell pepper, and shredded 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 thoroughly to coat everything evenly. Let simmer for 2 minutes to allow flavors to meld.
07 - Add the cooked noodles to the skillet. Toss everything together using tongs or a spatula until noodles are evenly coated with sauce and heated through, about 2 minutes.
08 - Remove from heat immediately. Sprinkle with sesame seeds and fresh cilantro or additional green onions. Serve hot while noodles retain their texture.