1. Combine broth and soy sauce in a medium saucepan. Bring to a boil over high heat. While broth mixture comes to a boil, combine cornstarch, pepper, and water in small bowl, stirring with a whisk until smooth. Gradually whisk cornstarch mixture into broth mixture. Reduce heat, and simmer, stirring frequently, 1 minute or until soup is slightly thickened.
2. Combine egg and egg white, stirring with a whisk until blended. Slowly add egg mixture to soup, stirring gently. Add chicken, green onions, and sesame oil; cook 1 minute or until thoroughly heated.
3. Ladle soup evenly into 4 bowls; garnish with cilantro, if desired.
Serve with: Asian Slaw