Step 1: Ensure your rice is cold and day-old. If not, cook it ahead of time and spread it on a tray to cool completely before refrigerating for at least a few hours, or overnight.
Step 2: In a medium bowl, toss the diced chicken with 1 tablespoon of soy sauce and a pinch of black pepper. Set aside.
Step 3: Whisk the eggs in a small bowl and set aside. Prepare all your vegetables, mincing garlic and ginger, dicing onion, and chopping green onions.
Step 4: In a small bowl, combine the remaining 2 tablespoons of soy sauce, dark soy sauce (if using), sesame oil, and oyster sauce (if using). Stir well and set aside.
Step 5: Preheat your Blackstone griddle to medium-high heat. Add 1 tablespoon of cooking oil to the griddle. Once shimmering, add the chicken pieces in a single layer. Cook for 3-4 minutes per side, stirring occasionally, until golden brown and cooked through. Push the cooked chicken to a cooler section of the griddle or transfer to a bowl.
Step 6: Add another tablespoon of cooking oil to the hot griddle. Add the diced yellow onion, shredded carrots, garlic, and ginger. Sauté for 2-3 minutes, stirring frequently, until the vegetables start to soften and become fragrant.
Step 7: Clear a small space on the griddle. Add a tiny bit more oil if needed. Pour the whisked eggs into the cleared space and quickly scramble them until just set, breaking them into smaller pieces. Once cooked, mix the scrambled eggs in with the sautéed vegetables.
Step 8: Bring the cooked chicken back to the main cooking area with the vegetables and eggs. Add the cold day-old rice to the griddle, spreading it out evenly.
Step 9: Drizzle the prepared soy sauce mixture over the rice. Using two spatulas, vigorously toss and chop the rice mixture, spreading it out to maximize contact with the hot griddle. Continue to stir-fry for 5-7 minutes, ensuring the rice grains separate, absorb the flavors, and get lightly crisped.
Step 10: Add the thawed frozen peas (and any other quick-cooking vegetables like corn) and most of the chopped green onions (reserve some for garnish) during the last minute of cooking. Toss everything together until well combined and heated through.
Step 11: Taste and adjust seasoning if necessary (add more soy sauce, salt, or pepper). Serve immediately, garnished with the remaining fresh green onions. Enjoy your ultimate chicken fried rice on blackstone!