01 - Heat olive oil in a large pot or Dutch oven over medium heat. Add the sausage and cook until browned, breaking it into crumbles, about 6 minutes. Transfer sausage to a plate, leaving a small amount of fat in the pot.
02 - Add the diced onion to the pot and sauté until softened, about 4 minutes. Stir in the minced garlic and cook until fragrant, about 1 minute.
03 - Return the browned sausage to the pot. Add the sliced potatoes and chicken broth. Bring to a boil, then reduce heat and simmer until the potatoes are fork-tender, about 15 to 20 minutes.
04 - Stir in the chopped kale and simmer until wilted and tender, about 3 to 4 minutes.
05 - Reduce heat to low and stir in the heavy cream. Heat through gently without bringing to a boil. Season with salt, black pepper, and red pepper flakes to taste.
06 - Ladle into bowls and serve hot, optionally garnished with grated Parmesan cheese and a light drizzle of olive oil.