Once your vegetables are tender, slice the smoked sausage into bite-sized pieces. Add the sausage to the pot and cook until browned, about 5-7 minutes.
Pour in the chicken broth, followed by the pasta. Stir in Cajun seasoning, garlic powder, and cayenne pepper if using.
Bring everything to a boil, then reduce heat and cover, letting it simmer for about 10-12 minutes. Stir occasionally until pasta is al dente.
Lower heat further before adding heavy cream and Parmesan cheese. Mix well until cheese melts into a smooth sauce.
If using spinach, stir in fresh spinach until wilted.
Lastly, plate your delicious pasta and garnish with chopped parsley before serving.