Step 1: Cook the Tortellini - Begin by bringing a pot of water to a boil. Once the water is boiling, add the tortellini and cook according to the package instructions, which typically takes 4-6 minutes. The tortellini is cooked when it floats to the top. Drain the tortellini and set it aside for later use.

Step 2: Brown the Kielbasa - In a large pot over medium-high heat, add a bit of oil. When the oil is hot, add the sliced kielbasa. Cook for about 3-5 minutes on each side, or until the sausage is brown and slightly crispy on the edges. This step will add a rich flavor to the soup.

Step 3: Sauté Onions and Tomatoes - To the same pot, add the chopped onions and sun-dried tomatoes. Cook for approximately 3-5 minutes, or until the onions are softened. Stir occasionally to ensure even cooking and prevent sticking. Add the garlic and cook for an additional minute, allowing it to release its aroma.

Step 4: Create the Creamy Base - Add the chicken broth, water, heavy cream, cream cheese, Cajun seasoning, pepper, and red pepper flakes to the pot. Stir continuously until the cream cheese is completely melted and the mixture becomes creamy. Adjust the seasonings to suit your taste preference.

Step 5: Combine and Simmer - Add the fresh spinach and the reserved cooked tortellini to the pot. Stir well to combine all the ingredients evenly. Let the soup simmer for a few minutes until the spinach wilts and the flavors meld together.

Step 6: Garnish and Serve - Once the soup is ready, garnish it with chopped fresh parsley and a generous sprinkle of Parmesan cheese. Serve the soup warm. Note that the soup will thicken as it sits, so enjoy it promptly for the best texture.