In a large skillet, heat olive oil and butter over medium-high heat. Add diced chicken and season with salt and pepper. Sear until golden brown, about 3-4 minutes.
Remove the chicken and set it aside. In the same skillet, add chopped onions and sauté until translucent, about 2-3 minutes. Stir in minced garlic and cook for an additional minute until fragrant.
Add orzo pasta to the skillet, stirring to combine with the aromatics. Toast for 1-2 minutes until slightly golden.
Pour in the low-sodium chicken broth and sprinkle in Cajun seasoning. Bring to a boil, then reduce heat, cover, and simmer for 10-12 minutes until the orzo is al dente.
Off the heat, gradually stir in the heavy cream and Parmesan cheese until the sauce is creamy and smooth.
Return the chicken to the skillet and heat through for a minute. Adjust seasoning as needed. Garnish with fresh parsley before serving.
