To prepare the chicken, in a bowl, combine the chicken with salt and white pepper and mix well, then set aside.
To prepare the ingredients, in a bowl, whisk the eggs until smooth, then in a separate bowl, mix the cornstarch with the water to form a slurry. Chop the scallions.
To bring the broth to a boil, in a pot over high heat, add the chicken stock and salt and bring to a gentle boil.
To cook the chicken and corn, add the chicken and corn to the pot and cook for about 2 minutes until the chicken is just cooked through.
To thicken, stir the slurry, then pour it into the pot and mix gently until the soup thickens slightly.
To add the eggs, set the heat to medium so the soup is still gently boiling, then slowly drizzle in the eggs in a thin stream. For thinner ribbons, gently stir as you pour; for thicker ribbons, let the eggs set for a few seconds before stirring.
To finish, add the scallions, sesame oil, and white pepper, then gently stir and serve immediately.