Cook the Pasta – Bring a large pot of salted water to a boil. Cook fettuccine according to package instructions until al dente, then drain and set aside.

Cook the Shrimp – In a large skillet, melt 3 tablespoons of butter. Sprinkle shrimp with Cajun seasoning and smoked paprika. Cook until shrimp turns pink and opaque. Remove and set aside.

Sauté Vegetables and Sausage – Add remaining butter to the skillet. Once melted, add green onions, bell peppers, mushrooms, diced tomato, and sausage. Cook until vegetables are tender and sausage is browned.

Add Garlic and Tomato – Stir in minced garlic and cook for 1 ½ minutes until fragrant.

Make Cream Sauce – Pour in heavy cream and let it simmer until slightly thickened. Stir in Parmesan cheese, lemon juice, and parsley. Season with salt and black pepper to taste.

Combine Pasta and Shrimp – Remove skillet from heat. Add the cooked fettuccine and shrimp. Toss everything together until evenly coated with the sauce.

Serve Hot – Plate immediately, garnish with extra parsley or Parmesan if desired.