Prepare the Rigatoni: In a large pot of salted boiling water, cook 1 lb of rigatoni pasta according to package instructions until al dente. Drain and set aside, reserving a little pasta water for later if needed.
Season the Chicken: While the pasta cooks, take 1 lb of chicken breast and season it with 2 tablespoons of Cajun seasoning. Ensure the chicken is coated well with the spices for maximum flavor.
Sauté the Chicken: In a large skillet, heat 2 tablespoons of olive oil over medium heat. Add the seasoned chicken and cook for about 6-7 minutes on each side, or until golden brown and fully cooked. Remove the chicken from the skillet and let it rest before slicing it into bite-sized pieces.
Prepare the Sauce: In the same skillet, add 1 medium diced onion and cook until soft, about 3-4 minutes. Stir in 3 minced garlic cloves and cook for an additional minute until fragrant.
Create the Creamy Mixture: Pour in 1 cup of heavy cream and bring it to a gentle simmer. Stir in 1 cup of grated Parmesan cheese until melted and well combined. Season with salt and black pepper to taste.
Combine Pasta and Chicken: Add the cooked rigatoni and sliced chicken to the sauce in the skillet, stirring to ensure everything is coated with the creamy mixture. If the sauce appears too thick, add a splash of reserved pasta water to reach desired consistency.
Serve: Dish out the Cajun Chicken Rigatoni onto plates and garnish with freshly chopped parsley. Enjoy the meal warm, savoring the rich flavors!