Prepare the Shrimp: In a bowl, toss shrimp with Cajun seasoning, oregano, salt, and pepper. Heat 1 tbsp olive oil in a large skillet over medium heat. Sauté shrimp for 2–3 minutes per side until pink and lightly browned. Remove and set aside.
Cook the Sausage: In the same skillet, heat the remaining 1 tbsp olive oil. Add sliced sausage and brown on both sides. Remove and set aside.
Sauté the Veggies: Add onions, bell peppers, and garlic to the skillet. Cook for 5 minutes or until soft and fragrant.
Make the Sauce: Stir in crushed tomatoes and chicken stock. Bring to a simmer. Add heavy cream and Parmesan cheese, stirring until smooth and slightly thickened. Taste and adjust seasoning with more Cajun spice, salt, or pepper if needed.
Cook the Pasta: While the sauce simmers, cook pasta according to package directions. Drain and add to the sauce.
Combine Everything: Return shrimp and sausage to the skillet. Toss well with the pasta until evenly coated and heated through.
Serve: Garnish with chopped fresh parsley and extra Parmesan if desired. Serve hot and enjoy the bold Cajun flavors!