Follow these instructions to create your incredibly comforting Zuppa Toscana:

1. Sauté Sausage: In a large pot, heat a tablespoon of olive oil over medium heat. Add the Italian sausage, breaking it apart as it cooks. Brown until fully cooked and no longer pink.
2. Add Aromatics: Once the sausage is browned, add the diced onion and minced garlic. Sauté until the onion is translucent, about 4-5 minutes.
3. Pour in Broth: Add the chicken broth to the pot, scraping any browned bits off the bottom for added flavor. Bring to a gentle boil.
4. Add Potatoes: Stir in the sliced potatoes. Reduce heat to a simmer and cook until potatoes are tender, around 15-20 minutes.
5. Mix in Kale: Once the potatoes are soft, add the chopped kale (or spinach) and red pepper flakes, if desired. Let it simmer for an additional 5 minutes.
6. Add Cream: Reduce the heat to low, then stir in the heavy cream. Allow the soup to warm through, adjusting seasoning with salt and pepper as needed.
7. Serve: Ladle the soup into bowls and garnish with freshly chopped parsley, if desired.

These simple steps will guide you in creating an unforgettable Zuppa Toscana that will fill your home with warmth and comfort.