Creating Asian-Style Garlic Beef is straightforward if you follow these simple steps:

1. Marinate the Beef: In a bowl, combine the thinly sliced flank steak with soy sauce and oyster sauce. Let it marinate for 10 minutes while you prepare the vegetables.
2. Prepare the Vegetables: Slice the bell pepper, julienne the carrot, and chop the broccoli into florets. Set aside.
3. Heat the Oil: In a large skillet or wok, heat the vegetable oil over medium-high heat until shimmering.
4. Cook the Beef: Add the marinated beef to the skillet, cooking for about 3-4 minutes until browned and cooked through. Remove the beef from the skillet and set it aside.
5. Sauté Garlic and Ginger: In the same skillet, add the minced garlic and ginger. Sauté for about 30 seconds until fragrant.
6. Add Vegetables: Toss in the bell pepper, broccoli, and carrot. Stir-fry for 4-5 minutes until the vegetables are tender-crisp.
7. Combine Ingredients: Return the cooked beef to the skillet, adding red chili flakes if desired. Stir everything together for an additional 2 minutes until heated through.
8. Garnish and Serve: Remove from heat and garnish with chopped green onions before serving.

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