Cut sausage lengthwise. Then cut into smaller pieces.
Saute bell peppers and onion for about 5-7 minutes, until tender. Add in sausage and diced tomatoes (with juice from can).
Simmer. Let the liquid reduce by half, keep on medium-low, stirring occasionally.
Boil a pot of salted water. Cook pasta as directed according to package.
Add in cream, cajun seasoning, and paprika to pot with veggies & sausage. Keep letting it simmer and reduce by half (this can take a little time, so be patient). If it doesn't reduce by half or thicken after about 30 minutes, in a small bowl mix a little cornstarch with cold water together and add to pot. This well help thicken the sauce.
After cream sauce has reduced, add in pasta and fully incorporate in the sauce. Let it simmer about 2 minutes so that the sauce can fully coat the pasta.