Creating this incredible Pepper Steak stir fry is simple when you follow these easy steps:

1. Prepare the Ingredients: Begin by slicing the flank steak, bell peppers, and onion. Mince the garlic and set everything aside.
2. Heat the Oil: In a large skillet or wok, heat the vegetable oil over medium-high heat until hot.
3. Cook the Beef: Add the sliced flank steak to the skillet in a single layer. Cook for 2-3 minutes, stirring occasionally until browned.
4. Add Vegetables: Toss in the sliced bell peppers, onion, and minced garlic. Stir-fry for another 2-3 minutes until the vegetables are tender-crisp.
5. Make the Sauce: In a small bowl, mix together the soy sauce, oyster sauce, cornstarch, and beef broth. Stir until well combined.
6. Combine Everything: Pour the sauce over the beef and vegetables in the skillet. Stir well to coat all ingredients. Cook for an additional 1-2 minutes until the sauce thickens slightly.
7. Season: Add salt and pepper to taste, adjusting flavors as desired.
8. Serve: Remove from heat and serve immediately over cooked rice or noodles.

These straightforward steps will guide you in creating a mouthwatering Pepper Steak that is sure to impress!