01 -
Combine sliced chicken, 1 tbsp olive oil, and 1 tbsp Cajun seasoning in a bowl. Mix thoroughly to coat evenly and set aside.
02 -
Boil rigatoni until just under al dente (about 1 minute less than package instructions). Reserve 1/2 cup of pasta water, then drain the rest.
03 -
Heat olive oil in a skillet over medium heat. Cook chicken pieces 2 to 3 minutes per side until golden brown and cooked through. Remove from skillet and set aside.
04 -
In the same skillet, add butter and sauté sliced onion and minced garlic until fragrant, about 2 minutes. Add sliced red bell pepper and cook for another minute.
05 -
Add tomato sauce, heavy cream, reserved pasta water, and remaining 1/2 tbsp Cajun seasoning to the skillet. Simmer for 2–3 minutes, stirring occasionally until the sauce thickens.
06 -
Add the cooked rigatoni and half of the cooked chicken to the sauce. Stir well and simmer for 1–2 minutes. Incorporate grated Parmesan and adjust seasoning to taste.
07 -
Divide pasta and sauce among plates. Top each serving with remaining chicken pieces. Garnish with chili flakes and fresh parsley if desired.