Heat the olive oil in a large skillet over medium-high heat. Once hot, add the diced chicken breast seasoned lightly with salt and pepper. Cook for about 5-6 minutes, stirring occasionally, until the chicken is golden brown and cooked through. Remove the chicken from the pan and set aside.
In the same skillet, add the chopped onion, minced garlic, and bell pepper. Sauté for about 4-5 minutes until the vegetables are soft and fragrant.
Stir in the orzo pasta and Cajun seasoning, ensuring the orzo is coated evenly with the spices and combined well with the vegetables.
Carefully pour in the chicken broth and bring the mixture to a gentle boil. Reduce the heat to low and simmer uncovered for about 10-12 minutes, stirring occasionally, until the orzo is cooked and the liquid is mostly absorbed.
Return the cooked chicken to the pan. Add the heavy cream and grated Parmesan cheese, stirring gently until the sauce is creamy and the cheese has melted. Cook for another 2-3 minutes until everything is heated through and well combined.
Taste and adjust seasoning with additional salt, pepper, or Cajun seasoning if desired. Garnish with freshly chopped parsley before serving.