Begin by gathering all your ingredients. Make sure your rice has been cooked and refrigerated overnight, as this will help achieve the perfect texture when frying. Thaw the frozen vegetables and mince the garlic.
In a wok or large skillet, heat the cooking oil over medium-high heat. Allow it to get hot but not smoking, which is key for frying.
Add the minced garlic to the hot oil and sauté for about 30 seconds, just until fragrant. Be careful not to burn it. Next, toss in the chopped lap cheong sausage and cook until slightly browned, about 2-3 minutes.
Push the garlic and sausage to the side of the pan. Pour the beaten eggs into the skillet and scramble them, mixing them into the sausage and garlic once they begin to set.
Stir in the thawed mixed vegetables, cooking for another minute until they are warmed through. Then, add the overnight steamed rice. Break apart any clumps and ensure everything is well mixed.
Drizzle the soy sauce, fish sauce, and oyster sauce over the rice. Sprinkle in the ground white or black pepper and salt to taste. Toss everything together, ensuring each grain of rice is coated with the sauces.
Once everything is heated through and well combined, remove from heat. Serve your Chinese Fried Rice hot, garnished with green onions if desired.