Saute the veggies. Heat the oil in a large pot over medium heat. Saute the mushrooms, kale, and scallions until softened.
Build the broth. Add the chicken bone broth, sea salt, turmeric, and pepper, and bring to a gentle boil.
Thicken the soup. Whisk the cornstarch with the cold water, then stir it into the boiling soup. Let thicken slightly.
Add the egg ribbons. Slowly pour in the whisked eggs while stirring to create silky ribbons.
Serve. Serve hot with extra scallions on top.
Notes
Stir the slurry: Cornstarch settles fast, so stir the slurry right before adding it to avoid lumps.Gentle boil: Keep the soup at a gentle boil so the eggs set into soft, silky ribbons.Pour slowly: A thin, steady stream of egg gives you long, delicate egg ribbons.Taste first: Broths vary in sodium, so taste before adding all of the salt.Storage: Store in an airtight container in the fridge for 3 to 4 days. Reheat gently on the stovetop.Freezing: Not recommended, since the eggs and thickened broth can turn watery once thawed.