In a medium pot, combine 2 cups chicken broth, 2 teaspoons reduced-sodium soy sauce, and 1/2 teaspoon ginger paste. Heat over medium-high heat until it just begins to boil.
While the broth heats, crack 2 large eggs into a bowl. Add a pinch of kosher salt and 1/4 teaspoon garlic powder. Whisk until the egg mixture is smooth.
When the broth begins to boil, reduce the heat to low so the liquid is at a gentle simmer.
Stir the simmering broth steadily in a circular motion with a spoon to create a gentle whirlpool.
Slowly drizzle the beaten egg mixture into the center of the whirlpool in a thin stream while continuing the circular stirring. Continue stirring gently while pouring.
After all the egg is added, stop stirring and let the eggs set into soft ribbons for about 10–20 seconds. Then remove the pot from the heat.
Ladle the soup into bowls and garnish with 1 large green onion, chopped (green parts only). Serve immediately.