Crack 2 large eggs into a bowl and whisk until well combined.
Pour the whisked eggs into a measuring cup and note their volume.
Add warm water or low-sodium chicken broth in a 2:1 ratio to the egg volume (for every 1 part egg, add 2 parts warm liquid). Add 2 pinches salt and gently mix to combine.
Pour the egg mixture through a fine-mesh sieve into a heatproof bowl (one that will fit in your steamer) to remove bubbles and foam.
Cover the bowl tightly with plastic wrap or a lid, leaving a small vent for steam to escape.
Fill the steamer pot with enough water so it will not touch the bowl, bring the water to a simmer over medium heat, then reduce to medium-low.
Place the covered bowl in the steamer, cover the steamer, and steam for 10–12 minutes until the surface is set but the center is still slightly jiggly when gently shaken.
Carefully remove the bowl from the steamer.
Drizzle 1 teaspoon sesame oil and 3/4 teaspoon soy sauce evenly over the steamed eggs.
Garnish with 1 tablespoon sliced scallions, if desired, and serve warm.