In a large pot of salted boiling water, cook the fettuccine according to package instructions until al dente. Drain and set aside, reserving about 1/2 cup of the pasta water.
While the pasta cooks, season the chicken breasts on both sides with Cajun seasoning, salt, and pepper.
In a large skillet, heat olive oil over medium-high heat. Add the seasoned chicken breasts and cook for about 6-7 minutes on each side, or until cooked through and golden brown. Remove the chicken from the skillet and allow it to rest for a few minutes before slicing it into thin strips.
In the same skillet, reduce the heat to medium and melt in the heavy cream. Stir in the minced garlic and cook for about 1-2 minutes until fragrant. Gradually whisk in the grated Parmesan cheese until smooth and creamy. If the sauce is too thick, add reserved pasta water a little at a time until you reach the desired consistency.
Add the cooked fettuccine and sliced chicken to the Alfredo sauce. Toss everything together to ensure the pasta and chicken are well-coated with the creamy sauce. Adjust seasoning with salt and pepper if necessary.
Plate the creamy Cajun chicken Alfredo topped with a sprinkle of fresh parsley and a dash of red pepper flakes for extra heat, if desired.
Notes
Serve in large pasta bowls, garnished with extra Parmesan cheese and a drizzle of olive oil for glitz!