Creating your Beef and Broccoli Lo Mein can be straightforward if you follow these simple steps:

1. Cook Noodles: Bring a pot of salted water to a boil. Add the lo mein noodles and cook according to the package instructions. Drain and set aside.

2. Prepare Beef: In a bowl, combine the sliced flank steak with soy sauce, oyster sauce, and cornstarch. Let it marinate while you prepare the remaining ingredients.

3. Heat the Skillet: Heat 1 tablespoon of vegetable oil in a large skillet or wok over medium-high heat.

4. Stir-fry Beef: Once the oil is hot, add the marinated beef. Stir-fry until browned and cooked through, about 3-5 minutes. Remove from the skillet and set aside.

5. Cook Broccoli: In the same skillet, add the remaining tablespoon of oil. Add the broccoli florets and stir-fry for about 3 minutes, until just tender but still crisp.

6. Add Aromatics: Stir in the minced garlic and grated ginger. Cook for another minute until fragrant.

7. Combine Ingredients: Return the beef to the skillet. Add the cooked lo mein noodles and sesame oil. Toss everything together until well combined.

8. Season: Add salt and pepper to taste. Continue to stir-fry for another couple of minutes, ensuring everything is heated through.

9. Serve: Remove from heat and garnish with chopped green onions before serving.

These steps will guide you in effortlessly creating this incredible meal!