Instructions:

1. Marinate the Beef:

. In a medium bowl, combine the sliced flank steak, 2 tablespoons soy sauce, and cornstarch.

. Mix well and allow it to marinate for 15 minutes.

2. Cook the Beef:

. In a large skillet or wok, heat the vegetable oil over medium-high heat.

. Add the marinated beef and stir-fry until browned and cooked through, about 4-5 minutes.

. Remove the beef from the skillet and set aside.

3. Stir-Fry the Vegetables:

. In the same skillet, add the sliced onion and bell peppers.

. Stir-fry for 3-4 minutes until the vegetables are tender-crisp.

4. Add Aromatics:

. Add the minced garlic and ginger to the skillet, stirring and cooking for another 1-2 minutes until fragrant.

5. Prepare the Sauce:

. In a small bowl, whisk together 1/4 cup soy sauce, beef broth, oyster sauce, hoisin sauce, sugar, black pepper, and red pepper flakes (if using).

6. Combine and Cook:

. Return the cooked beef to the skillet and pour the sauce mixture over the beef and vegetables.

. Stir everything together and cook for another 2-3 minutes until the sauce has thickened and everything is well-heated.

7. Serve:

. Serve the pepper steak over cooked rice and garnish with chopped green onions.
This flavorful pepper steak with onions is a quick, satisfying dish packed with savory and mildly spicy notes!