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