In a large pot of boiling salted water, add the fettuccine. Cook according to the package instructions until al dente, usually about 8-10 minutes. Once cooked, drain and set aside, remembering to reserve a little pasta water in case you need to thin the sauce later.
In a mixing bowl, take the sliced chicken and toss it with Cajun seasoning until well-coated. Ensure all strips are evenly covered for consistent flavor.
In a large skillet over medium-high heat, warm the olive oil. Once hot, add the seasoned chicken strips in a single layer. Cook for 5-7 minutes, flipping halfway, until the chicken is golden brown and cooked through. Remove the chicken from the skillet and set aside on a plate.
Using the same skillet, add the diced onion and sauté for about 2-3 minutes, or until it becomes translucent. Then, stir in the minced garlic and sliced red bell pepper. Continue cooking for an additional 3-4 minutes until the pepper is soft and fragrant.
Carefully pour in the chicken broth and heavy cream, using a spatula to scrape up any flavorful bits from the skillet. Stir well to combine and bring the mixture to a dull simmer, allowing it to thicken slightly.
Return the seared chicken to the skillet, followed by the cooked fettuccine. Toss everything together until the pasta and chicken are thoroughly coated in the creamy sauce. Taste and season with salt, pepper, and smoked paprika if desired. If the sauce is too thick, add a splash of the reserved pasta water to reach your preferred consistency.
Allow the dish to simmer on low for an extra 2-3 minutes, letting the flavors combine. Remove from heat and sprinkle freshly chopped parsley over the top for a burst of color and freshness.
Notes
Serve with garlic bread or a mixed salad for a complete meal.