In a large pot of salted boiling water, add the pasta and cook according to package instructions. Once done, drain and set the pasta aside.
While the pasta is boiling, cut the chicken breasts in half lengthwise to make 4 chicken cutlets. In a small bowl, mix 2 teaspoons of cajun seasoning, salt, garlic powder, and the onion powder together. Now rub ½ tablespoon of olive oil over both sides of the chicken cutlets and season the chicken breasts with the seasoning mix. Rub the seasoning into the chicken well on both sides.
In a large deep skillet, heat 2 tablespoons of olive oil over medium heat. Add the seasoned chicken breasts and cook for roughly 4 minutes on each side until the chicken is cooked through. Remove the chicken to a separate plate and cover with foil to keep warm.
In the same skillet, melt the butter and add the diced onion, bell pepper, and garlic. Sauté for 2-3 minutes until the veggies are slightly tender and fragrant.
Now reduce the heat to medium-low and add in the chicken broth. Scrape up any brown bits that may still be stuck to the bottom of the pan.
Next add the heavy cream, parmesan cheese, and remaining 2 teaspoons of cajun seasoning. Stir well until the parmesan cheese has melted. Let the sauce simmer for 3 minutes until it starts to thicken. Taste the sauce at this point and add more salt or pepper if needed.
Add the cooked pasta to the skillet with the sauce. Mix well until all the pasta is fully coated with the cajun cream sauce.
Slice the chicken breasts into strips or cut them into bite size pieces. Add the chicken on top or mix it in with the pasta. Garnish with fresh parsley and extra parmesan cheese (optional). Enjoy!