Sauté the Vegetables: In a large soup pot, heat olive oil over medium heat. Add the chopped onion, carrots and garlic. Sauté for about 5 minutes until the vegetables become tender and the onions turn translucent.
Add the Chicken: Add the chicken to the pot and cook for another 5-7 minutes, or until the chicken has some brown color on the bottom.
Season: Season the mixture with dried thyme, dried oregano, salt, and pepper. Stir well to coat the chicken and vegetables with the herbs and spices.
Add Broth and Orzo: Pour in the chicken broth and bring the mixture to a boil. Boil for 10-15 minutes until the chicken is cooked through. Take the chicken out for shredding and add the orzo pasta in the meantime. Reduce the heat to a simmer. Cook for about 8-10 minutes, or until the orzo is tender but still slightly firm to the bite. Stir occasionally to prevent sticking. Add the shredded chicken back in the pot.
Taste and Adjust: Taste the soup and adjust the seasoning with more salt and pepper if needed. If the soup is too thick, you can add a bit of water or more chicken broth to reach your desired consistency.
Serve: Ladle the chicken orzo soup into bowls and garnish with fresh parsley and lemon juice. Serve hot with some crusty bread or crackers.