Cook the Pasta: Bring a large pot of salted water to a rolling boil. Add linguine or fettuccine and cook according to package instructions until al dente, about 8–10 minutes. Drain and set aside.

Sauté the Vegetables: Heat olive oil in a large skillet over medium heat. Add onion, red bell pepper, and green bell pepper; sauté for about 5 minutes until tender.

Brown the Sausage: Stir in minced garlic and sliced sausage, cooking for an additional 3 to 4 minutes until sausage is browned.

Add the Shrimp: Add shrimp to the skillet and cook until they turn pink and opaque, about 3 to 4 minutes.

Create the Creamy Sauce: Add diced tomatoes and heavy cream to the skillet. Stir in Cajun seasoning, salt, and pepper. Simmer for 5 to 7 minutes until slightly thickened.

Combine the Pasta and Sauce: Toss drained pasta into the skillet, mixing to coat evenly. Heat through for 2 to 3 minutes.

Finish and Serve: Mix in parsley and Parmesan cheese just before serving. Plate and garnish with extra parsley if desired.