Creating Beef Fried Rice is easy if you follow these simple steps:

1. Prep Your Ingredients: Gather and measure out all your ingredients before starting to cook.
2. Heat Oil: In a large skillet or wok, heat the vegetable oil over medium-high heat.
3. Cook Beef: Add the thinly sliced beef to the skillet. Cook for about 3-4 minutes, stirring frequently, until browned and cooked through.
4. Add Garlic: Stir in the minced garlic and cook for an additional minute until fragrant.
5. Add Vegetables: Toss in the mixed vegetables and continue to stir-fry for about 2-3 minutes until tender.
6. Create a Well: Push the beef and vegetables to the side of the pan. Pour the beaten eggs into the cleared space and scramble them until fully cooked.
7. Add Rice: Add the cold, cooked rice to the skillet. Break up any clumps, and mix everything together until well combined.
8. Season: Pour the soy sauce and oyster sauce (if using) over the rice mixture. Drizzle in sesame oil. Stir well to coat all ingredients.
9. Finish Up: Cook for an additional 2-3 minutes, stirring frequently, until everything is heated through.
10. Garnish: Lastly, mix in the chopped green onions. Season with salt and pepper to taste.

By following these steps, you can create an incredible Beef Fried Rice that is sure to impress.