Heat vegetable oil in a large wok or pan over high heat until shimmering.
Add minced garlic and diced onions, sautéing for 30 seconds until fragrant.
Add shrimp, chicken, and char siu to the pan, cooking for 3-4 minutes until proteins are fully cooked.
Push all ingredients to one side of the pan and pour beaten egg into the empty space, scrambling until just set.
Add day-old rice, peas, and carrots, breaking up any rice clumps and stir-frying for 2-3 minutes.
Pour soy sauce, oyster sauce, and rice wine over the rice, stirring continuously to coat evenly.
Drizzle sesame oil over the rice and add sliced green onions, tossing everything together for final 30 seconds.
Serve immediately while hot.