Creating Beef Lo Mein is straightforward when you follow these easy steps:

1. Cook the Noodles: Boil the lo mein noodles in a pot of salted water according to the package instructions. Drain and set aside.
2. Prep for Cooking: While the noodles are cooking, prepare all the vegetables and beef by slicing and chopping as needed.
3. Heat the Oil: In a large skillet or wok, heat the vegetable oil over medium-high heat.
4. Sauté Beef: Add the thinly sliced beef to the skillet. Stir-fry for 3-4 minutes until browned. Season with salt and pepper.
5. Add Vegetables: Add the minced garlic, grated ginger, bell peppers, broccoli, and carrots to the skillet. Stir-fry for an additional 4-5 minutes until the vegetables are tender-crisp.
6. Mix the Sauce: In a small bowl, combine soy sauce, oyster sauce, sesame oil, and red pepper flakes (if using) to make the sauce.
7. Combine: Add the cooked noodles and sauce mixture to the skillet. Toss everything together until well combined and heated through, about 2-3 minutes.
8. Finish and Serve: Stir in the chopped green onions. Taste and adjust seasoning if necessary.
9. Garnish: Remove from heat, and if desired, sprinkle sesame seeds on top for added flavor and presentation.

With these simple steps, you can whip up a scrumptious Beef Lo Mein that is sure to impress your guests!