Traditional recipes for Chinese Egg Drop Soup typically contain cornstarch to thicken the broth. However, since this is a Keto version, I skip the thickener completely. Personally, I think the texture of the egg ribbons combined with the spinach give this Keto Egg Drop Soup the perfect consistency and therefore, no thickener is needed. However, if you like yours thicker and still insist it needs one, you can thicken your soup with a sprinkle of xanthan gum. Start with 1/4 teaspoon at a time until you reach your desired thickness. Be mindful that a little goes a long way, though and adding too much will leave you with a slimy, gummy and extra thick soup that is probably inedible.