Heat the vegetable oil in a large skillet or wok over medium-high heat.
Add the chicken pieces and cook until they are browned and cooked through, about 5-7 minutes.
Push the chicken to one side of the skillet and add the garlic, peas, and carrots to the other side. Sauté for 2-3 minutes until the garlic is fragrant and vegetables are tender.
Add the cooked rice and soy sauce to the skillet, stirring to combine all the ingredients.
Push the rice mixture to the sides of the skillet, creating a well in the center. Pour the beaten eggs into the well and scramble until fully cooked. Stir the eggs into the rice mixture.
Add the green onions and sesame oil, stirring everything together until well combined and heated through.
Serve the chicken fried rice hot, garnished with extra green onions if desired.