Creating amazing Chinese beef at home is straightforward when you follow these easy steps:

1. Marinate the Beef: In a mixing bowl, combine sliced beef with soy sauce, oyster sauce, and cornstarch. Mix until the beef is well-coated. Let it marinate for about 10 minutes.
2. Prepare the Vegetables: While the beef is marinating, slice the bell pepper, and chop the broccoli and green onions. Set aside.
3. Heat the Oil: In a large pan or wok, heat vegetable oil over medium-high heat.
4. Cook the Beef: Add the marinated beef to the hot pan in a single layer. Cook for 2-3 minutes until browned, then flip and cook for another 2-3 minutes. Remove the beef and set aside.
5. Stir-Fry the Vegetables: In the same pan, add garlic and ginger. Sauté for about 30 seconds until fragrant. Then add bell pepper and broccoli. Stir-fry for about 5 minutes until vegetables are tender yet crisp.
6. Combine Ingredients: Return the cooked beef to the pan with the vegetables. Add sesame oil, salt, and pepper to taste. Stir everything together and cook for an additional 2 minutes to heat through.
7. Serve: Remove from heat and garnish with green onions.

These easy-to-follow instructions will help you create a delicious and flavorful Chinese beef dish effortlessly.