In a large pot or Dutch oven, brown the Italian sausage over medium heat. Break it into small pieces with a spoon as it cooks.
Once the sausage is browned, add minced garlic and white onion to the pot. Sauté until the onion becomes translucent and the garlic is aromatic.
Stir in the sun-dried tomatoes, ensuring they are evenly distributed in the mixture.
Pour in the heavy cream, stirring continuously to incorporate it into the sausage mixture.
Add the low-sodium chicken broth to the pot, continuing to stir to combine all the ingredients.
Stir in the tortellini pasta, ensuring it is submerged in the liquid. Cook according to the package instructions or until the tortellini is al dente.
Once the tortellini is cooked, add the kale to the pot. Allow it to wilt and cook for a few minutes.
In a small bowl, mix together the Cajun seasoning, paprika, salt, chicken bouillon, pepper, red pepper flakes, and cayenne pepper. Add this spice mixture to the soup, adjusting to taste if needed.
Add in cheese of choice and allow it to melt.
Let the soup simmer for an additional 5-10 minutes to allow the flavors to meld together.