01 - Heat vegetable oil in a skillet over medium heat. Add onions and carrots; cook for 2–3 minutes until softened.
02 - Add diced chicken and frozen peas to the skillet; cook for 1 minute, stirring occasionally.
03 - Add cooked rice to the pan, breaking up any clumps. Stir-fry for 2 minutes until grains are evenly coated and heated through.
04 - Add ketchup and soy sauce, mixing thoroughly until the rice turns a uniform reddish color. Season with salt and pepper to taste. Remove from heat and let cool slightly.
05 - Whisk eggs, milk, and salt in a bowl until smooth and slightly frothy.
06 - Heat half the butter in a non-stick skillet over medium-low heat. Pour in half the egg mixture, swirling to coat the pan in a thin, even layer.
07 - When the eggs are just set but still slightly runny on top, mound half the fried rice in the center. Carefully fold both sides of the omelette over the rice using a spatula, shaping it into an oval or log.
08 - Slide the omurice onto a plate, seam side down. Cover with a piece of paper towel and gently shape if needed.
09 - Repeat the omelette process with the remaining butter, egg mixture, and fried rice for the second serving.
10 - Drizzle ketchup over the top of each omurice and sprinkle with chopped parsley, if desired. Serve immediately.