Follow these simple steps to create your 30-Minute Stir Fried Korean Beef and Toasted Sesame Noodles:

1. Marinate the Beef: In a bowl, combine the soy sauce, sesame oil, brown sugar, garlic, and ginger. Add the sliced beef, and mix well. Marinate for at least 10 minutes.
2. Prep the Vegetables: While the beef is marinating, chop your mixed vegetables into bite-sized pieces.
3. Cook the Noodles: If you haven’t done so already, prepare your noodles according to package instructions. Once cooked, drain and set aside.
4. Heat the Pan: In a large skillet or wok, heat 1 tablespoon of cooking oil over medium-high heat.
5. Sear the Beef: Add the marinated beef (discard any leftover marinade) to the hot pan in a single layer. Cook for about 2-3 minutes on each side, or until the beef is browned and cooked through. Remove the beef from the pan and set aside.
6. Stir-Fry the Vegetables: In the same pan, add another tablespoon of oil if needed. Add the mixed vegetables and stir-fry for about 3-5 minutes until they are tender yet still crisp.
7. Combine Ingredients: Return the cooked beef to the pan along with the prepared noodles. Toss everything together until well combined and heated through.
8. Add Sesame Seeds: Sprinkle the toasted sesame seeds over the dish and mix to incorporate.
9. Season: Taste and adjust the seasoning with salt and pepper as needed.
10. Serve: Garnish with sliced green onions and additional herbs if desired. Serve hot.

These straightforward steps will lead you to prepare a truly amazing dish that everyone will enjoy!