Creating Beef Stir Fry with Rice is straightforward when you follow these easy steps:

1. Prepare Rice: Cook rice according to package directions. Set aside once done.
2. Marinate Beef: In a bowl, mix sliced beef with soy sauce, oyster sauce, and cornstarch. Let it marinate for about 10 minutes.
3. Heat Oil: In a large wok or skillet, heat vegetable oil over medium-high heat until shimmering.
4. Cook Beef: Add the marinated beef to the skillet in a single layer. Cook for 3-4 minutes, stirring occasionally until the beef is browned but not fully cooked. Remove from the skillet and set aside.
5. Stir-fry Vegetables: In the same skillet, add garlic, bell peppers, broccoli, and mushrooms. Stir-fry for 3-5 minutes until the vegetables are tender-crisp.
6. Combine Ingredients: Return the cooked beef to the skillet with the vegetables. Stir everything together and cook for another 2 minutes to heat through.
7. Add Rice: Add the cooked rice to the skillet. Stir everything together. If the mixture seems dry, feel free to add a splash of soy sauce or a bit of water at this point.
8. Season: Season with salt and pepper to taste. Continue stirring for 1-2 minutes, allowing all flavors to meld.
9. Garnish: Remove from heat. Top with chopped green onions and a sprinkle of sesame seeds if desired.
10. Serve: Transfer to plates or bowls and serve hot.

Following these steps will ensure a flavorful and enjoyable Beef Stir Fry with Rice that is sure to impress.