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 evenly 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 celery to the pot. Cook for 5 minutes, stirring occasionally, until the vegetables are softened. Add the minced garlic and cook for 1 additional minute until fragrant.
03 - Stir in the cubed butternut squash, dried thyme, ground nutmeg, and half of the chopped fresh sage. Season with salt and pepper to taste. Sauté for 2 to 3 minutes, allowing the flavors to meld.
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 base for a creamy consistency. Leave some texture intact for a chunkier result, or blend completely for a silky smooth 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 chopped sage. Heat gently without boiling, then 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, finely chopped 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 to each bowl and gently drag a spoon or knife through it to create a decorative swirl. Garnish with additional fresh sage or cracked pepper and serve immediately.