01 - Heat a large, deep skillet or Dutch oven over medium-high heat. Add butter and let it melt completely.
02 - Toss the diced chicken with 1 tablespoon of Cajun seasoning, salt, and pepper. Add chicken to the pan and sauté until browned on all sides (4–5 minutes). Remove chicken and set aside.
03 - In the same pan, add chopped onion and red bell pepper. Sauté for 3 minutes until softened, then add garlic and cook for another 30 seconds until fragrant.
04 - Add orzo to the pan, stirring to coat in the flavors for about 1 minute until lightly toasted.
05 - Pour in chicken broth and heavy cream, scraping up any browned bits from the pan. Stir in the remaining Cajun seasoning and smoked paprika.
06 - Return the chicken to the pan. Bring to a gentle simmer, reduce heat to low, cover, and cook for 12–15 minutes, stirring occasionally, until orzo is al dente and liquid is mostly absorbed.
07 - Stir in Parmesan cheese, spinach (if using), and crushed red pepper flakes if desired. Cook for 1–2 more minutes, until cheese is melted and spinach is wilted.
08 - Taste and adjust salt and pepper as needed. Remove from heat and let rest for a couple of minutes before serving to allow flavors to meld.
09 - Garnish with chopped fresh parsley and serve immediately while hot.