In a frying pan, bring Seasonings and onion to a boil. Lower the heat to medium and cook onion until wilted.
Put chicken katsu in it and turn the heat up to medium high heat. Pour and distribute beaten egg (2 eggs) evenly.
When egg is half cooked, add mitsuba and turn off the heat. Serve rice in a Donburi bowl and put Chicken and egg mixture on top. Serve with Ichimi togarashi (chili pepper) on the side.