1️⃣ Brown the sausage: In a large saucepan over medium heat, cook the Italian sausage and diced onion together, breaking apart the sausage with a spoon as it cooks. Cook until the sausage is browned and the onion is softened. Drain any excess grease.

2️⃣ Add garlic and spices: Add the garlic, ground fennel, and red pepper flakes. Stir and cook for about 1 minute until fragrant.

3️⃣ Add liquids and pasta: Pour in the chicken broth, diced tomatoes (with their juices), pasta, and Italian seasoning. Stir to combine, then bring to a boil. Once boiling, reduce heat and let simmer for 6-8 minutes, or until the pasta is cooked to al dente.

4️⃣ Incorporate cheeses and cream: Add the grated Parmesan, softened cream cheese, and heavy cream. Stir and allow the cheeses to melt into the soup, about 3-5 minutes, until the soup is creamy and well blended.

5️⃣ Season and garnish: Taste and season with salt and pepper as needed. Stir in chopped parsley if desired.

6️⃣ Serve: Ladle the soup into bowls and enjoy while hot!