Rub the Cajun seasoning all over the chicken breasts, ensuring they are well coated. Let them rest for about 10-15 minutes to absorb the flavors.
Bring a large pot of salted water to a boil. Add the fettuccine pasta and cook according to package instructions until al dente. Reserve ½ cup of pasta water, then drain and set aside.
In a large skillet, heat the olive oil over medium-high heat. Add the seasoned chicken breasts and cook for about 6-7 minutes per side or until fully cooked and the internal temperature reaches 165°F (75°C). Remove the chicken from the skillet and let it rest before slicing it into strips.
In the same skillet, add the diced onion and sliced bell peppers. Sauté for about 4-5 minutes until they are soft. Then, add the minced garlic and sauté for an additional 1 minute.
Pour in the chicken broth and bring the mixture to a gentle simmer. Reduce the heat and stir in the heavy cream, allowing it to thicken slightly for 2-3 minutes. Add the grated Parmesan cheese, stirring until melted and incorporated.
Add the cooked fettuccine to the sauce, tossing to coat the pasta. If the sauce is too thick, add a bit of the reserved pasta water to reach the desired consistency. Season with salt and pepper to taste.
Plate the creamy Cajun chicken pasta and top with the sliced chicken. Garnish with chopped parsley for a fresh touch.
Notes
For extra flavor, let the chicken marinate in the Cajun seasoning for longer.