Add in the additional ingredients except the kale and bring to a low boil. Once it is boiling, quickly reduce to a simmer.
1 bay leaf, ¾ teaspoon red pepper flakes, 1 can diced tomatoes in juice, 1 tablespoon tomato paste, 3 cups chicken broth, rind from a wedge of Parmesan cheese, salt and pepper to taste, additional Parmesan for serving
Simmer for at least one hour. Add in the kale during the last 5 to 10 minutes of cooking.
1 cup frozen kale
Remove the bay leaf and Parmesan rind before serving. Serve with extra Parmesan cheese on top.
Notes
Any nutritional information is an estimate by online calculators. Please verify using your own data.Be sure to remove the Parmesan rind and bay leaf before serving or storing the soup.