Start by bringing a large pot of salted water to a boil. Add the fettuccine and cook according to package instructions until al dente. Once done, drain the pasta but reserve about 1 cup of the pasta water. Set aside the drained pasta.
In a medium bowl, place the peeled and deveined shrimp. Sprinkle the Cajun seasoning over the shrimp and toss thoroughly to ensure each shrimp is evenly coated with the seasoning.
Heat the olive oil in a large skillet over medium-high heat. When the oil is shimmering, carefully add the seasoned shrimp. Sauté for 2-3 minutes on each side, or until the shrimp are pink and fully cooked. Once cooked, transfer the shrimp to a plate and set aside.
In the same skillet, lower the heat to medium and add the butter. Allow it to melt completely before adding the minced garlic. Sauté the garlic for about 1 minute, stirring frequently, until it becomes fragrant and lightly golden.
Slowly pour the heavy cream into the skillet, stirring constantly. Bring the cream to a gentle simmer, allowing it to thicken slightly, which should take around 3-4 minutes.
Gradually whisk in the freshly grated Parmesan cheese until the sauce is smooth and creamy. If the sauce appears too thick, stir in a splash of the reserved pasta water until you reach your desired consistency. Taste the sauce and season with salt and freshly ground black pepper as needed.
Gently fold the cooked fettuccine and sautéed shrimp into the creamy Alfredo sauce, ensuring that everything is evenly coated.
Transfer the Cajun Shrimp Alfredo to serving bowls and garnish with freshly chopped parsley for a vibrant finish.
Notes
Serve in deep bowls, topped with a sprinkle of extra Cajun seasoning and a few fresh parsley leaves for an eye-catching touch.