01 - Heat olive oil in a large pot or deep skillet over medium-high heat. Season the diced chicken with salt and pepper, then cook until golden brown and cooked through, about 5 to 6 minutes. Transfer to a plate and set aside.
02 - In the same pot, melt the butter over medium heat. Add the diced onion, carrots, and celery. Sauté until the vegetables are softened and fragrant, about 5 minutes.
03 - Sprinkle the flour over the sautéed vegetables and stir continuously for 1 minute to form a light roux and cook off the raw flour taste.
04 - Gradually pour in the chicken broth while stirring constantly to prevent lumps. Bring the mixture to a gentle simmer.
05 - Stir in the orzo pasta, garlic powder, dried thyme, and dried parsley. Reduce the heat to medium-low and cook uncovered, stirring occasionally, until the orzo is al dente, about 10 minutes.
06 - Return the cooked chicken to the pot and add the frozen peas. Simmer together for 3 minutes until the peas are heated through and the chicken is warmed.
07 - Stir in the heavy cream and Parmesan cheese until the sauce is smooth and creamy. Adjust seasoning with additional salt and pepper as needed.
08 - Ladle into bowls and serve hot, garnished with extra parsley or Parmesan if desired.