Creating this Mediterranean Lemon Chicken Soup is simple when you follow these steps:

1. Heat Olive Oil: In a large pot, heat the olive oil over medium heat.
2. Sauté Vegetables: Add chopped onion, garlic, carrots, and celery. Sauté until vegetables are tender, about 5-7 minutes.
3. Add Chicken: Place the chicken breasts into the pot, allowing them to sear slightly for about 2 minutes on each side.
4. Pour Broth: Add the chicken broth, diced tomatoes, thyme, and bay leaves. Bring to a boil.
5. Simmer: Once boiling, reduce heat to low and let simmer for about 20 minutes, or until chicken is cooked through.
6. Remove Chicken: Carefully take the chicken out, letting it cool slightly before shredding or cubing it.
7. Cook Pasta: Return the broth to a gentle boil and add the orzo pasta. Cook according to package instructions, usually about 8-10 minutes.
8. Return Chicken: Once the pasta is cooked, return the shredded chicken to the pot.
9. Add Lemon Juice: Stir in the lemon juice and season with salt and pepper to taste.
10. Serve: Remove bay leaves and serve hot, garnished with fresh parsley if desired.

Following these steps will guide you in creating a delightful and flavorful Mediterranean Lemon Chicken Soup that everyone will enjoy.