toscana zuppa recipe

Ingredients: 1 pound Italian sausage (mild or spicy, based on preference) 1 tablespoon olive oil 1 medium onion, chopped 3 cloves garlic, minced 4 cups chicken broth 2 cups water 4-5 medium potatoes, thinly sliced 2 cups kale, chopped 1 cup heavy cream 1/2 teaspoon crushed red pepper flakes (optional, for heat)