Heat a large skillet or wok over medium-high heat. Add the sliced Chinese sausage and cook for 2–3 minutes, allowing it to release some of its flavorful oils.
Add the shrimp and cook for 1-2 minutes on each side. Take oujt the sausage and shrimp and set aside.
Add the minced garlic and sauté for about 30 seconds, until fragrant.
Add onions and cook until translucent.
Add the day-old rice and use your spatula to break up any clumps. Stir-fry for 2–3 minutes until the rice is heated through.
Add the soy sauce, oyster sauce, and fish sauce. Toss everything together until the rice is evenly coated with the seasonings.
Push the rice to one side of the pan and add the whisked eggs to the empty side. Cook until the eggs are about 80% set, then stir them into the rice.
Add the cooked Chinese sausage and shrimp back to the pan, along with the corn and peas. Toss everything together and cook for another 1–2 minutes, until heated through.
Top with sliced green onions and serve immediately. Enjoy!