Marinate the Beef: In a medium bowl, combine the sliced flank steak, 2 tablespoons soy sauce, and cornstarch. Mix well and let it marinate for 15 minutes.
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.
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.
Add Aromatics: Add the minced garlic and ginger to the skillet and stir-fry for another 1-2 minutes until fragrant.
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