Knoephla Soup

Name: Knoephla Soup
Ingredients: 3 tablespoons unsalted butter; 2 large carrots, chopped; 2 celery stalks, chopped; 1 large onion, chopped; Kosher salt and freshly ground black pepper; 2 cloves garlic, minced; 1/2 teaspoon ground nutmeg; 10 cups chicken or vegetable stock; 1/2 teaspoon dried thyme; 4 sprigs fresh parsley, chopped; 2 sprigs fresh dill, chopped; 2 bay leaves; 1 1/2 pounds (680 grams) red potatoes, chopped into 1/2-inch pieces; 1/2 cup (120 grams) heavy cream; 3 1/4 cups (422 grams) all-purpose flour, plus more for dusting; 1 1/2 teaspoons baking powder; 1 1/4 teaspoons kosher salt; Freshly ground black pepper; 1/8 teaspoon ground nutmeg; 1 large egg