Preheat your griddle on high to about 400 F. If you can, keep the temperature on one side set low so you can move things around while you're cooking
Add a tablespoon of oil to the griddle and use your spatula to spread it around. Add the onion, peas, and carrots and cook for 2-3 minutes, or until the onion starts to soften
Push the vegetables to the side with the lower heat. Add 2 tablespoons of oil to the griddle and add the cooled rice in a thin layer. Season with salt and pepper and let it cook undisturbed for 3-4 minutes. Then use your spatula to mix it together and break up any clumps. Slide the rice to the side and mix in the vegetables
Add 1 tablespoons of oil to a clear area of the griddle. Add the chicken, then season with salt, pepper, and granulated garlic (or garlic powder). The small pieces of chicken will cook quickly. When cooked, add to the fried rice
Add the soy sauce and sesame oil to the chicken fried rice. Mix together well and let it cook for 3-5 minutes
Pour beated eggs onto a clear area of the grill. Cook the eggs and then mix in with the fried rice until everything is incorporated. If you are using MSG, sprinkle it on now and mix a little more
Remove the chicken fried rice from the griddle, sprinkle with thinly sliced scallions, and serve with Yum Yum sauce or Japanese BBQ sauce