Heat olive oil in a large skillet or wok over medium-high heat. Add the diced chicken breast and season with salt and pepper. Stir-fry until golden and cooked through, about 5-7 minutes. Remove the chicken from the pan and set aside.
In the same skillet, add the sesame oil and allow it to heat. Add the minced garlic and grated ginger, stirring for about 30 seconds until fragrant.
Push the garlic and ginger to one side of the skillet and pour the beaten eggs into the other side. Scramble the eggs until fully cooked, then mix them into the garlic-ginger mixture.
Add the mixed vegetables to the skillet and stir-fry for another 2-3 minutes until they are heated through.
Add the cooked rice and return the chicken to the pan. Pour in the soy sauce and mix everything together thoroughly. Stir-fry for an additional 3-5 minutes, ensuring that the rice is well combined and heated through.
Stir in the chopped green onions, and adjust seasoning with more salt or soy sauce if needed.
Remove from heat and serve hot, garnishing with sesame seeds if desired.
Notes
Serve in large bowls with a sprinkle of sesame seeds on top and extra green onions for added color.