01 - Heat 1 tablespoon vegetable oil in a large skillet over medium heat. Add diced chicken and cook until no longer pink throughout.
02 - Add onions and carrots to the skillet and sauté until softened. Add frozen peas, stir, and cook for 1 minute.
03 - Add cooked rice, breaking up any clumps. Stir well to combine with the vegetables and chicken.
04 - Pour in ketchup and soy sauce. Mix thoroughly until rice is evenly coated and heated through. Season with salt and pepper to taste. Remove from pan and shape rice into two oval mounds on serving plates.
05 - In a bowl, whisk together 2 eggs, 1 tablespoon milk, and a pinch of salt until well combined. Repeat with remaining 2 eggs and 1 tablespoon milk for the second omelette.
06 - Heat 1 teaspoon butter in a nonstick frying pan over medium-low heat. Pour in half the egg mixture, swirling to coat the pan. Cook, stirring gently, until edges are set but center remains slightly runny.
07 - Slide the omelette onto one rice mound, shaping it over the rice to drape naturally. Repeat with remaining egg mixture and butter for the second serving.
08 - Drizzle extra ketchup over each omurice. Garnish with chopped parsley if desired. Serve immediately.