01 - Cook pasta in a large pot of salted boiling water according to package directions until al dente. Drain thoroughly and set aside.
02 - Combine chicken strips with Cajun seasoning, smoked paprika, salt, and black pepper in a bowl. Toss until evenly coated on all sides.
03 - Heat 1 tablespoon olive oil and 1 tablespoon butter in a large skillet over medium-high heat. Add seasoned chicken and cook 5–6 minutes, turning occasionally, until browned and cooked through. Transfer to a plate and reserve.
04 - In the same skillet, add remaining olive oil and butter. Sauté bell peppers and red onion for 3–4 minutes until softened. Add garlic and cook 1 minute until fragrant.
05 - Pour chicken broth into skillet, scraping up browned bits from bottom. Reduce heat to medium. Stir in heavy cream and Parmesan cheese, whisking constantly until smooth and cheese is melted.
06 - Return cooked chicken to skillet. Simmer 2–3 minutes until sauce thickens slightly. Taste and adjust seasoning if necessary.
07 - Add cooked pasta to sauce, tossing until well coated and heated through, about 1–2 minutes.
08 - Plate immediately, sprinkling generously with chopped fresh parsley.