Add chicken broth and water to a soup pot amd bring to a boil. Lower the heat to medium and add chicken breast into the soup. Skim off the foam on the surface. Continue cooking the chicken for 3 to 5 minutes until cooked through.
Add the creamy sweet corn, white pepper, and salt and thicken the soup with cornstarch mixture. (Gently stir the cornstarch mixture before adding to the soup.) Stir the soup with a ladle and turn off the heat.