In 5-quart Dutch oven, cook and drain fettuccine or linguine noodles as directed on package. Return to Dutch oven; cover to keep warm.
Meanwhile, in a 12-inch non-stick skillet, heat oil over medium-high heat. Cook onion, bell peppers and garlic on oil for 3 to 4 minutes, stirring frequently, until vegetables are crisp-tender. Add sausage; cook 3 to 4 minutes, stirring frequently,until vegetables are tender.
Stir in tomatoes and Cajun seasoning into sausage mixture. Stir in whipping cream; cook uncovered for 5 to 8 minutes, stirring occasionally, or until mixture is thickened.
Add sausage mixture to noodles in Dutch oven; toss to combine. Sprinkle with cheese and chopped fresh parsley, if desired.