01 - Melt butter in a large pot or deep skillet over medium heat. Add onions, carrots, and celery. Sauté for 4–5 minutes until vegetables begin to soften.
02 - Stir in minced garlic and cook for 1 minute until fragrant.
03 - Sprinkle flour over the vegetables and stir to coat evenly. Cook for 1 minute to remove raw flour taste.
04 - Slowly whisk in chicken broth, then add milk and bring to a gentle simmer, stirring constantly.
05 - Add orzo, thyme, parsley, salt, and pepper. Stir well. Reduce heat to medium-low and simmer, uncovered, for 10–12 minutes, stirring occasionally to prevent sticking, until orzo is al dente and sauce thickens.
06 - Stir in heavy cream, cooked chicken, and peas. Simmer for 3–5 more minutes, until chicken is heated through and the peas are tender. Adjust seasoning as needed. Remove from heat and let sit for 2–3 minutes to thicken.