01 - Dice all vegetables, beat eggs in small bowl, and ensure rice is thoroughly chilled with grains separated for proper texture.
02 - Heat 1 tablespoon vegetable oil in large wok over medium-high heat. Pour in beaten eggs and scramble until just set, about 30 seconds. Remove from pan and set aside.
03 - Add remaining oil to wok. Stir-fry diced onion, minced garlic, and grated ginger for 1-2 minutes until fragrant and onions begin to soften.
04 - Add diced bell pepper and thawed peas and carrots. Stir-fry for 2-3 minutes until vegetables are just tender-crisp.
05 - Increase heat to high. Add cold rice to wok, breaking up any clumps with spatula. Stir-fry for 2-3 minutes until rice is heated through and slightly toasted.
06 - Add cooked protein (if using) and scrambled eggs back to wok. Toss everything together to distribute evenly.
07 - Pour soy sauce, oyster sauce, sesame oil, and pepper over rice. Toss thoroughly to coat all ingredients evenly and heat through, about 1 minute.
08 - Stir in chopped green onions and remove from heat immediately. Taste and adjust seasoning with additional salt or soy sauce if needed.
09 - Transfer to serving platter or individual bowls. Garnish with extra green onions if desired and serve immediately while hot.