Preheat the Blackstone griddle over medium low heat. (about 350 F)
Add the vegetable oil onto the griddle and spread it around. Add the diced chicken to the vegetable oil and sauté the chicken is cooked through (4-5 minutes). Push the chicken to the cooler side of the grill.
Then add in the peas and carrots mix, garlic, and the green onions. Sauté the vegetables until they're heated through.
Move the vegetables to a cool part of the griddle and then add the beaten eggs to the heated side of griddle.
Scramble the eggs, then move them to the cooler side of the griddle with the veggies.
Add the cold cooked rice to the griddle and top it with the sesame oil, soy sauce, and black pepper. Sauté the rice on the griddle for 3-4 minutes until heated through and slightly browned.
Combine the rice, chicken, veggies, and eggs together on the griddle. Serve immediately while warm and enjoy!