Season and Sear Chicken:
Toss chicken pieces with 1 tablespoon Cajun seasoning, salt, and pepper.
In a large pot or deep skillet, heat olive oil over medium-high heat. Sear chicken until golden and cooked through, about 4–5 minutes. Remove and set aside.
Sauté Vegetables:
In the same pot, melt butter. Add bell peppers and garlic. Cook 2–3 minutes until softened and fragrant.
Deglaze and Simmer:
Stir in chicken broth, heavy cream, and remaining Cajun seasoning. Bring to a simmer.
Cook the Pasta:
Add dry pasta directly to the pot. Stir and cook uncovered for 10–12 minutes, stirring occasionally, until pasta is tender and sauce has thickened.
Finish and Combine:
Reduce heat to low. Stir in parmesan cheese until melted. Add the cooked chicken back to the pot and toss to coat in the sauce.
Serve:
Garnish with chopped parsley or green onions. Serve hot with extra parmesan if desired.