Bring a large pot of salted water to a boil and add the fettuccine. Cook until al dente, about 8-10 minutes.
Meanwhile, in a large skillet, heat the olive oil over medium-high heat. Add the shrimp and season with Cajun seasoning. Cook until the shrimp is just cooked through, about 3-4 minutes. Remove the shrimp from the pan and set aside.
Add the onion to the same skillet and cook for about 2 minutes. Add the garlic and cook for an additional 30 seconds.
Add the cream and Parmesan cheese and stir until the cheese is melted and the sauce is creamy. Add the cooked shrimp back to the skillet and stir to combine.
Drain the cooked fettuccine and add it to the skillet. Toss to combine and season with salt and pepper to taste.
Serve with extra Parmesan cheese and freshly chopped parsley, if desired.
Interesting Facts
Cajun seasoning is a blend of herbs and spices that originates from the Louisiana bayou.
Alfredo sauce is usually made with butter, cream, and Parmesan cheese.
Fettuccine is a type of Italian pasta that is similar to linguine but thicker.