01 - In a large pot or Dutch oven, heat olive oil over medium heat. Add the sausage and cook until browned, breaking it into crumbles, about 6 minutes. Transfer sausage to a plate and set aside, leaving a little fat in the pot.
02 - Add diced onion to the pot and sauté until softened, about 4 minutes. Stir in the garlic and cook until fragrant, 1 minute.
03 - Return the sausage to the pot. Add potatoes and chicken broth. Bring to a boil, then reduce heat and simmer until potatoes are tender, about 15–20 minutes.
04 - Stir in chopped kale and simmer until wilted, 3–4 minutes.
05 - Lower the heat and stir in the heavy cream. Heat through but do not boil. Season with salt, black pepper, and red pepper flakes to taste.
06 - Serve hot, optionally garnished with grated Parmesan and a drizzle of olive oil.