Heat the Oil: In a large wok or frying pan, heat the vegetable oil over medium heat.
Sauté Aromatics: Add the chopped onion and garlic, sautéing until they become translucent.
Cook Vegetables: Stir in carrots, peas, corn, and bell peppers. Cook until just tender.
Add Rice: Gently fold in the cooked rice, ensuring not to mash the grains.
Make Space for Eggs: Push the rice mixture to the side of the pan, pour the beaten eggs into the cleared space, and scramble.
Mix Everything: Once the eggs are cooked, mix them with the rice and vegetables.
Season: Drizzle soy sauce and oyster sauce over the rice, mixing well. Season with salt and pepper.
Serve: Garnish with green onions before serving.