Cook the rotini pasta according to package instructions, then drain and set aside.
Season chicken breasts with cajun seasoning on both sides.
In a large skillet, heat olive oil over medium-high heat.
Add the chicken breasts and cook for about 6-7 minutes on each side until golden brown.
Remove the chicken from the skillet and let it rest for a few minutes.
In the same skillet, add chopped onion and bell peppers; sauté until softened.
Pour in chicken broth and bring to a simmer.
Add heavy cream and Parmesan cheese, stirring to combine.
Slice the cooked chicken and return it to the skillet.
Add the cooked pasta to the sauce, mixing well to combine all ingredients.