In a large pot, combine the chicken broth, cooked chicken, frozen corn, diced carrots, and green onions. Bring to a boil over medium-high heat.
Once boiling, reduce the heat to medium and add the soy sauce, sesame oil, ginger, and black pepper. Stir well.
In a small bowl, mix the cornstarch and water until smooth. Slowly pour this mixture into the soup while stirring continuously to thicken.
Allow the soup to simmer for about 5 minutes, stirring occasionally.
Slowly drizzle the beaten egg into the soup while stirring gently to create egg ribbons.
Remove from heat and serve hot.