Creating Thai Basil Beef is simple when you follow these easy steps:

1. Prep the Ingredients: Start by slicing the flank steak thinly against the grain. Mince the garlic and slice the chilies and red bell pepper.
2. Heat the Oil: In a large skillet or wok, heat the vegetable oil over medium-high heat until shimmering.
3. Cook the Beef: Add the sliced beef to the skillet in a single layer. Allow it to sear without moving it for about 2 minutes.
4. Stir-Fry: Once the beef has seared, stir-fry for another 2-3 minutes until cooked through. Remove the beef from the skillet and set aside.
5. Sauté Aromatics: In the same skillet, add minced garlic and sliced chilies. Sauté for about 30 seconds until fragrant.
6. Add Vegetables: Toss in the sliced red bell pepper and stir-fry for another 2 minutes until slightly tender.
7. Combine Sauces: In a small bowl, mix the soy sauce, oyster sauce, fish sauce, and sugar. Pour this mixture into the skillet.
8. Return Beef: Add the cooked beef back to the skillet, stirring to coat everything evenly in the sauce.
9. Finish with Basil: Remove the skillet from heat and stir in the Thai basil leaves until they wilt.
10. Serve: Serve the Thai Basil Beef hot over cooked jasmine rice.