Heat 1 tablespoon of oil in a large heavy-bottom stock pan over medium heat. While the oil is heating season the cubed chicken with kosher salt and pepper. Add to the heated oil, and cook the chicken until until golden on each side. Once seared, remove the chicken from the pan, place it on a plate, and set aside.
If the pan is dry, add the remaining 1 tablespoon olive oil to the pan. Add in the diced onions, carrots, and celery, and saute until the onion is translucent and softened. about 3-5 minutes. Stir in 1 tablespoon minced garlic and 1 tablespoon fresh thyme leaves and cook for 30-60 seconds, to just lightly toast.
Stir ½ cup dry white wine, or additional stock, and scrape up any browned bits off the bottom of the inner pot. Let simmer for 1-2 minutes to reduce by half.
Add 6 cups chicken stock, 2 dried bay leaves, and ½ teaspoon crushed red pepper flakes to the pan, stir, and bring the mixture to a boil.
Once boiling, stir in the seared chicken and any juices that accumulated on the plate and 1 cup uncooked orzo pasta to the soup. Reduce the heat to medium and simmer until the orzo is tender, about 9-10 minutes.
Turn off the heat and stir in the the zest and juice of 1 large lemon. Taste to adjust seasonings.
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Notes
Wine: Use a dry white wine suitable for drinking, such as a pinot grigio or resiling. Otherwise, use additional stock. Thyme: If you don’t have fresh thyme, you can use ½ teaspoon of dried thyme leave. Do not use ground thyme.Crushed Red Pepper Flakes: Omit, or reduce, the red pepper flakes if you are sensitive to heat.Using Leftover Cooked Chicken: Reduce the olive oil to 1 tablespoon, skip searing the chicken, add 3-4 cups of shredded or diced cooked chicken to the soup for the last 5 minutes of simmering, just to warm it through.Storage: Store the leftover soup in an airtight container in the refrigerator for 3-4 days. Alternatively, store the leftover soup in a freezer-safe container, leaving 1-inch space for expansion in the freezer for up to 3 months. When reheating, thin out with broth or water as needed, adding a pinch of salt to help season.