Ginger Zucchini Noodle Egg Drop Soup

Name: Ginger Zucchini Noodle Egg Drop Soup
Total time: 25 min
Yield: 5 servings
Ingredients: 4 zucchini medium to large; 2 tablespoons extra-virgin olive oil; 2 tablespoons minced ginger; 5 cups shiitake mushrooms sliced; 8 cups vegetable broth divided; 2 cups water divided; 1/2 teaspoon red pepper flakes; 5 tablespoons tamari sauce low-sodium, or soy sauce; 2 cups scallions thinly sliced, divided; 4 large eggs beaten; 3 tablespoons corn starch; salt; pepper