In a small bowl, lightly beat the eggs together.
In a wok or sauce pot, bring the chicken stock to a simmer. Add the soy sauce and bring to a boil.
Whisk cornstarch with 1-2 tablespoons water until smooth. Add to stock and whisk until dissolved. Bring the soup back to a boil.
Very slowly pour in the eggs in a steady stream. To make shreds, stir the egg rapidly in a clockwise direction for one minute. To make thin streams or ribbons, gently stir the eggs in a clockwise direction until they form.
Season with salt and pepper.
Top with scallions before serving (if using).
Serve warm and enjoy!