Season the sliced chicken with Cajun seasoning, salt, and pepper.

Heat the olive oil in a skillet over medium heat. Add the chicken and cook until golden brown and fully cooked through. Remove the chicken from the skillet and set aside.

Boil the penne pasta in a pot of salted water until al dente. Drain the pasta and reserve 1/2 cup of the pasta water.

In the same skillet used for the chicken, melt the butter over medium heat and add the minced garlic. Sauté for about 1 minute until fragrant.

Pour in the heavy cream and let it simmer for 3-4 minutes, stirring often.

Stir in the grated Parmesan cheese and the reserved pasta water until reaching a creamy consistency.

Add the cooked penne pasta to the skillet and toss to combine.

Plate the creamy pasta, top it with the Cajun chicken, and sprinkle with fresh parsley.

Serve hot.