01 - Heat olive oil in a large soup pot or Dutch oven over medium heat. Add the Italian sausage, breaking it apart with a wooden spoon, and cook until thoroughly browned. Transfer the sausage to a plate using a slotted spoon, leaving the rendered fat in the pot.
02 - Add the diced onion, sliced carrots, and sliced celery to the pot. Cook for approximately 5 minutes, stirring occasionally, until the vegetables have softened. Add the minced garlic and continue cooking for 1 minute until fragrant.
03 - Stir in the cubed butternut squash, dried thyme, ground nutmeg, and half of the chopped fresh sage. Season generously with salt and freshly ground black pepper. Sauté for 2 to 3 minutes to allow the flavors to develop.
04 - Pour in the chicken broth and bring to a boil. Once boiling, reduce the heat to a gentle simmer. Cover the pot and cook for 20 minutes, or until the butternut squash is fork-tender.
05 - Use an immersion blender to partially or fully purée the soup to your preferred consistency. For a chunkier texture, blend only half of the soup. For a silkier result, purée the entire base.
06 - Return the browned sausage to the pot. Stir in the cheese tortellini and simmer uncovered for 6 to 8 minutes, until the tortellini are cooked through and tender.
07 - Pour in the heavy cream and add the remaining fresh sage. Heat gently without boiling. Taste and adjust the seasoning with additional salt and pepper as needed. Remove from heat.
08 - In a small mixing bowl, combine the softened cream cheese, ricotta cheese, finely chopped fresh sage, milk, and a pinch of salt and pepper. Blend until completely smooth and creamy.
09 - Ladle the hot soup into serving bowls. Add a generous spoonful of the sage cheese swirl mixture to each bowl and gently swirl it into the surface using a spoon or knife. Garnish with additional fresh sage leaves or cracked black pepper and serve immediately.