1. Cook the egg noodles according to package instructions until al dente. Drain and set aside.
2. In a large skillet or wok, heat the vegetable oil over medium-high heat. Add the ground beef, cooking until browned and no longer pink, about 5-7 minutes. Drain excess fat.
3. Push the beef to one side of the pan and add the onion and garlic. Sauté until the onion is translucent and the garlic is fragrant, roughly 2 minutes.
4. Add the bell pepper and broccoli, stirring occasionally, until tender-crisp, about 4 minutes.
5. In a small bowl, whisk together the soy sauce, oyster sauce, sesame oil, ground ginger, and brown sugar. Pour the mixture over the beef and vegetables, stirring to coat everything evenly.
6. Add the cooked noodles to the skillet, tossing gently to combine all ingredients. Cook for another 2-3 minutes until everything is heated through.
7. Garnish with sliced green onions and season with salt and pepper to taste before serving.

As you stir, let the aromas transport you to a place of culinary nostalgia, where every ingredient plays a role in crafting a memory worth savoring.