In a large pot, heat 2 tablespoons of olive oil over medium heat. Add the crumbled turkey sausage and cook until browned and fully cooked, about 5-7 minutes. Use a spoon to break it up into small pieces as it cooks.
Once the sausage is cooked, add the diced onion and minced garlic to the pot. Sauté for another 3-4 minutes until the onion is translucent and fragrant.
Pour in the chicken broth and add the thinly sliced potatoes. Bring the mixture to a boil, then reduce to a simmer. Cover and cook for about 15-20 minutes, or until the potatoes are tender.
Stir in the chopped kale, heavy cream, and red pepper flakes. Let the soup simmer for an additional 5 minutes to allow the flavors to meld.
Taste and season with salt and pepper as needed. If you prefer more heat, feel free to add more red pepper flakes.
Ladle the soup into bowls and garnish with freshly chopped parsley. Serve warm with crusty bread on the side.