Creating One-Pot Chicken Fried Rice is straightforward. Follow these steps to ensure a delicious outcome:

1. Heat Oil: In a large skillet or wok, heat the vegetable oil over medium-high heat.
2. Cook Chicken: Add the diced chicken to the skillet, seasoning with salt and pepper. Cook for about 5-6 minutes or until the chicken is no longer pink. Remove the chicken from the skillet and set aside.
3. Sauté Vegetables: In the same skillet, add the minced garlic and cook for 30 seconds until fragrant. Then add the frozen mixed vegetables and sauté for 3-4 minutes until heated through.
4. Add Eggs: Push the vegetables to one side of the skillet and pour the beaten eggs into the empty space. Scramble the eggs until fully cooked, then mix them with the vegetables.
5. Combine Rice: Add the cooked rice to the skillet, breaking up any clumps. Stir to combine with the vegetables and eggs.
6. Season: Pour in the soy sauce and oyster sauce (if using), stirring well to ensure the rice is evenly coated. Cook for an additional 2-3 minutes, allowing the rice to heat through.
7. Return Chicken: Add the cooked chicken back to the skillet and stir everything together until heated through.
8. Finish with Sesame Oil: Drizzle the sesame oil over the top and add the sliced green onions. Give it one last stir to combine.
9. Serve: Remove from heat and serve hot, garnished with extra green onions if desired.

These steps will guide you to create a flavorful One-Pot Chicken Fried Rice that is sure to become a family favorite.