Begin by marinating the beef slices in soy sauce, garlic, and ginger for 10 minutes.
While the beef marinates, cook the egg noodles according to package instructions. Drain and set aside.
Heat vegetable oil in a large skillet over medium-high heat.
Add the marinated beef to the skillet and sear for 3-4 minutes until browned.
Remove the beef from the skillet and set aside.
Add the mixed vegetables to the skillet and stir-fry for about 5 minutes.
Return the beef to the skillet and mix well with the vegetables.
Add the cooked noodles to the skillet and toss everything together.
Drizzle with oyster sauce, and add salt and pepper to taste.
Garnish with fresh coriander and serve hot.