Prepare the Chicken: Season the diced chicken breasts with a pinch of salt and pepper. Heat 1 tablespoon of sesame oil in a large skillet or wok over medium-high heat. Cook the chicken until golden brown and crispy on the outside, about 7-8 minutes, and cooked through. Remove from the pan and set aside.
Cook the Vegetables: In the same pan, add the remaining tablespoon of sesame oil. Add the minced garlic and diced onion, cooking for 1-2 minutes until fragrant and softened. Then, add the mixed vegetables (peas, carrots, and corn) and cook for another 3-4 minutes, until tender.
Fry the Rice: Add the cooked rice to the pan, breaking up any clumps with a spatula. Stir-fry the rice for 5-7 minutes until it becomes slightly crispy on the edges.
Add the Eggs: Push the rice to one side of the pan, and in the empty space, pour the beaten eggs. Scramble the eggs and cook until fully set, about 2 minutes. Once cooked, stir the eggs into the rice.
Combine and Season: Add the cooked chicken back into the pan. Pour in the soy sauce, oyster sauce (if using), rice vinegar, and grated ginger (if using). Stir everything together, ensuring it’s evenly mixed. Taste and adjust seasoning with salt and pepper as needed.
Finish and Serve: Garnish the fried rice with chopped green onions and sesame seeds if desired. Serve immediately and enjoy!