Begin by boiling a large pot of salted water. Add the pasta and cook according to package instructions until al dente. Drain and set aside.

In a large skillet, heat olive oil over medium-high heat. Season the chicken breasts with salt, pepper, and 1 teaspoon of Cajun seasoning. Cook the chicken for about 6-7 minutes on each side or until cooked through. Remove from the pan and let it rest before slicing.

In the same skillet, add the chopped onion and bell pepper. Sauté for about 3-4 minutes until tender. Add garlic and cook for an additional minute.

Pour in the chicken broth and heavy cream, stirring to combine. Add the remaining Cajun seasoning and season with salt and pepper to taste. Let the sauce simmer for 5-8 minutes until it thickens slightly.

Add the cooked pasta to the skillet and toss to coat. Slice the chicken and arrange it on top. Serve with grated Parmesan cheese and a sprinkle of fresh parsley if desired.