Step 1: Preheat your Blackstone griddle to medium-high heat and apply a thin layer of vegetable oil across the surface.
Step 2: Place the diced chicken on one side of the griddle. Season with pepper and cook for 5-7 minutes, turning occasionally, until golden brown and cooked through.
Step 3: On the other side of the griddle, sauté the onions, peas, and carrots in a little oil until the onions become translucent and soft.
Step 4: Add the minced garlic and grated ginger to the vegetable mixture, stirring for 30 seconds until fragrant.
Step 5: Push the vegetables and chicken to the cooler edges of the griddle. Pour the beaten eggs onto the center and scramble them quickly with your spatula.
Step 6: Add the cold rice to the center of the griddle. Use your spatulas to break up any large clumps and spread the rice out in a thin layer.
Step 7: Add the butter to the rice and let it melt. Toss the rice, chicken, vegetables, and eggs together until thoroughly combined.
Step 8: Drizzle the soy sauce, oyster sauce, and toasted sesame oil over the entire mixture. Toss and chop with your spatulas for another 2-3 minutes until the rice is heated through and slightly crispy.
Step 9: Remove from the griddle, garnish with sliced green onions, and serve the ultimate chicken fried rice on blackstone immediately.