Rinse the chicken breast dumplings and rice cakes under running water.
Pour the broth into a pot and bring it to a boil.
Add the dumplings and rice cakes to the boiling broth and cook for 3 minutes.
Beat the egg and slowly pour it into the soup, stirring gently.
Season with green onion, salt, and pepper to taste.
Serve in a bowl and garnish with toppings such as seaweed flakes and sesame seeds.