Heat butter and olive oil in a large soup pot. Add the carrots, celery, and onions and cook over medium heat until they begin to soften, about 8-10 minutes.
Stir in the flour, and continue cooking for another minute.
2 tablespoons flour
Slowly stir in the chicken broth, making certain you scrape up any bits from the bottom of the pan.
6 cups chicken broth
Add the whole chicken breast and the seasoning. Cook over medium heat until the broth begins to simmer. Lower heat and simmer for 15-18 minutes until the chicken breast is fully cooked (165°F).
Remove the chicken breast and place on a plate to rest.
Add the orzo and cook for 10-12 minutes until it's cooked.
1 cup orzo pasta
After the chicken has rested for 5-7 minutes, dice it into ½ inch pieces. Return chicken and any accumulated juices back to the pot. The chicken can be added while the orzo is still cooking.
Add cream and cook for 4-5 minutes until heated through.
¾ cup cream
Season with salt and pepper to your liking.
Remove from heat. Add lemon juice and fresh parsley. Serve hot.