Creating Chinese Pepper Steak with Onions can be straightforward if you follow these simple steps:

1. Prepare the Beef: In a bowl, combine the sliced flank steak with cornstarch. Toss to coat evenly. This will help create a nice texture.
2. Heat Oil: In a large skillet or wok, heat 1 tablespoon of vegetable oil over medium-high heat.
3. Cook the Beef: Add the beef to the skillet in a single layer. Cook for about 2-3 minutes until browned. Remove the beef from the pan and set aside.
4. Stir-Fry Vegetables: In the same skillet, add the remaining tablespoon of oil. Sauté the sliced bell pepper and onion for about 3-4 minutes until they begin to soften.
5. Add Aromatics: Stir in the minced garlic and ginger. Cook for an additional minute until fragrant.
6. Combine Ingredients: Return the cooked beef to the skillet. Add soy sauce, oyster sauce, sesame oil, black pepper, and sugar. Toss everything together until well coated.
7. Cook Further: Stir-fry for an additional 2-3 minutes until everything is heated through and well combined.
8. Garnish: Remove from heat and garnish with chopped green onions.

These steps will guide you in creating this incredible dish effortlessly.