In a large pot, bring generously salted water to a rolling boil. Add the fettuccine and cook according to the package instructions until al dente, usually about 8-10 minutes. Once done, drain the pasta and set it aside, making sure to reserve 1 cup of pasta water for later.
In a medium-sized mixing bowl, add the peeled and deveined shrimp. Sprinkle the Cajun seasoning over the shrimp and toss gently until each piece is evenly coated with the spices.
Heat 2 tablespoons of olive oil in a large skillet over medium-high heat. Once the oil is hot, carefully add the seasoned shrimp to the skillet. Cook for 2-3 minutes on each side, or until the shrimp turn pink and opaque. Once cooked, remove the shrimp from the skillet and set them aside on a plate.
In the same skillet, reduce the heat to medium and add 2 tablespoons of unsalted butter. As it melts, add the minced garlic and sauté for about 1 minute, stirring frequently to prevent burning, until the garlic becomes fragrant.
Gradually pour in the heavy cream while stirring continuously to combine. Let the cream simmer on medium-low heat for 2-3 minutes until it slightly thickens. Next, whisk in the freshly grated Parmesan cheese, stirring until the cheese completely melts and the sauce achieves a smooth and creamy consistency.
Return the sautéed shrimp to the skillet, followed by the cooked fettuccine. Toss everything together gently, adding reserved pasta water a little at a time until you reach your desired sauce consistency, making sure the pasta and shrimp are thoroughly coated in the creamy sauce.
Taste the dish and season with salt and freshly ground black pepper as needed. Serve the Spicy Cajun Shrimp Alfredo immediately, garnished with a sprinkle of freshly chopped parsley for a vibrant touch.
Notes
Serve in shallow bowls with a sprinkle of cheese and parsley for presentation.