bring stock to a boil (or bring water to a boil and mix in bouillon)
add in frozen corn and let simmer for 5 minutes
give the cornstarch slurry a good mix to loosen any cornstarch that might have settled, then pour it into the broth and let it thicken
while swirling the water with one hand, pour in the beaten egg
season with a splash of soy sauce, drizzle of sesame oil, and white pepper to taste
garnish with scallions if desired