Cook pasta according to package directions.
While pasta is cooking melt butter in a saute' pan.
Slice chicken breasts into thin strips and saute' with butter and minced garlic over medium heat.
Add cajun seasoning.
Add onion and red pepper
Once chicken is almost cooked add the sausage and spinach. Cover the pan.
Continue to cook for 4 to 5 minutes.
Add cream (or sour cream) and cook an additional 4 minutes over low heat.
Mix in shredded parmesan cheese.
Add salt and pepper to taste.
Pour sauce over pasta and serve.