Creating a delicious Beef Chow Mein is simple when you follow these clear steps:

1. Cook the Noodles: Begin by boiling the chow mein noodles according to package instructions. Drain and set aside.
2. Prepare the Beef: In a bowl, marinate the sliced flank steak with soy sauce, cornstarch, and a pinch of salt for about 10 minutes.
3. Heat the Oil: In a large wok or skillet, heat 1 tablespoon of vegetable oil over high heat.
4. Stir-Fry the Beef: Add the marinated beef to the hot pan in batches, cooking until browned. Remove from the pan and set aside.
5. Sauté Vegetables: In the same skillet, add the remaining oil. Stir-fry the onion, carrots, and bell pepper for 2-3 minutes until tender-crisp.
6. Add Garlic and Bean Sprouts: Stir in the minced garlic and bean sprouts, cooking for an additional minute.
7. Combine Everything: Return the beef to the skillet, adding the cooked noodles, green onions, and the sauce mixture (beef broth, oyster sauce, sesame oil).
8. Toss to Combine: Stir-fry everything together for 2-3 minutes until heated through and the sauce thickens.
9. Taste and Adjust: Adjust seasoning with salt and pepper as needed.
10. Serve Hot: Dish out the Beef Chow Mein immediately, garnishing with additional green onions if desired.

Following these steps guarantees a flavorful Beef Chow Mein that will be a family favorite!