Cook the Pasta: Begin by bringing a large pot of salted water to boil. Add the fettuccine and cook according to the package instructions until it reaches al dente texture. Once done, drain the pasta and set it aside, reserving a cup of the pasta water in case you need to adjust your sauce consistency later.
Season the Shrimp: In a medium mixing bowl, combine the peeled and deveined shrimp with Cajun seasoning. Toss them gently until each shrimp is evenly coated with the seasoning.
Sauté the Shrimp: In a large skillet, heat the olive oil over medium-high heat until shimmering. Add the seasoned shrimp to the skillet in a single layer, making sure not to overcrowd them. Sauté for about 2-3 minutes on each side or until they turn pink and opaque. Once cooked, remove the shrimp from the skillet and set aside on a plate.
Prepare the Alfredo Sauce: In the same skillet, lower the heat to medium and add the unsalted butter. Once melted, stir in the minced garlic and sauté for about 1 minute, just until fragrant and lightly golden. Carefully pour in the heavy cream and allow it to come to a gentle simmer, stirring occasionally.
Combine Ingredients: Gradually whisk in the freshly grated Parmesan cheese, stirring continuously until the cheese is fully melted and the sauce is smooth and creamy. If the sauce becomes too thick, add a splash of the reserved pasta water until it's your desired consistency. Taste and season the sauce with salt and freshly ground black pepper as needed.
Mix It All Together: Add the cooked fettuccine directly to the creamy Alfredo sauce. Gently toss the pasta until it is well coated. Next, fold in the sautéed shrimp, being careful not to break them apart, until everything is mixed together evenly.
Serve: Plate the Cajun Shrimp Alfredo immediately while hot, and garnish with a generous sprinkle of freshly chopped parsley for a pop of color and flavor.
Notes
Serve immediately for the best flavor and texture.