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; sauté until softened. Add frozen peas, stir, and cook for 1 minute.
03 - Add cooked rice to the skillet, breaking up any clumps. Stir well to combine with the vegetables and chicken.
04 - Pour in ketchup and soy sauce. Mix thoroughly until the rice is evenly coated and heated through. Season with salt and pepper to taste. Remove from pan and shape the rice into two oval mounds on serving plates.
05 - In a bowl, whisk together eggs, milk, and a pinch of salt until well combined.
06 - Heat 1 teaspoon butter in a nonstick frying pan over medium-low heat. Pour in half the egg mixture, swirling to coat the bottom. Cook, stirring gently, until the edges are set but the center remains slightly runny.
07 - Slide the omelette onto one rice mound, shaping it over the rice to cover it completely.
08 - Repeat the omelette process with the remaining egg mixture and second rice mound. Drizzle extra ketchup over each omurice and garnish with parsley if desired. Serve immediately.