Bring a large pot of salted water to a rolling boil. Add the bowtie pasta and cook according to the package instructions until al dente. Drain the pasta using a colander.
In a large skillet, heat olive oil over medium-high heat. Coat the chicken breast slices with Cajun seasoning and add them to the skillet. Cook for approximately 6-8 minutes until the chicken is golden and cooked through.
In the same skillet, reduce the heat to medium and add the butter. Once melted, add the garlic and onion. Stir in the heavy cream, and gradually whisk in the Parmesan cheese.
Return the cooked chicken to the skillet, and gently add the cooked bowtie pasta. Stir until each piece is coated with the sauce.
Transfer the pasta to serving plates, garnish with chopped parsley, and serve immediately.
Notes
Store leftovers in an airtight container and refrigerate for up to 3 days. Add a splash of milk or cream when reheating.