Toss chicken cubes in 1.5 tablespoons of Cajun seasoning until evenly coated.
Heat olive oil in a large skillet over medium-high heat. Sear chicken until browned and cooked through, then remove and set aside.
In the same skillet, melt butter and sauté onion and bell pepper for 5 minutes until softened.
Add minced garlic and remaining Cajun seasoning; cook for 1 minute until fragrant.
Incorporate dried orzo into the skillet and toast for 2 minutes, stirring frequently to prevent sticking.
Pour in chicken stock. Bring to a boil, then reduce heat to low and simmer, covered, for 10 to 12 minutes or until orzo is al dente and liquid is mostly absorbed.
Stir in heavy cream and parmesan cheese until the sauce thickens and reaches a creamy consistency.
Return the cooked chicken to the skillet and toss to combine. Adjust seasoning with salt and pepper.
Garnish with fresh parsley before serving.