In a large pot, bring the chicken broth to a boil.
Add the orzo pasta and cook until al dente, about 8-10 minutes.
Lower the heat to a simmer and add the shredded chicken.
In a medium bowl, whisk the eggs and lemon juice together.
Slowly add a ladle of the hot soup broth into the egg mixture, whisking continuously to temper the eggs.
Gradually add the egg mixture back into the pot of soup, stirring constantly.
Add the baby spinach and let it wilt in the soup for a few minutes.
Season with salt and black pepper to taste.
Serve hot and enjoy your Greek Lemon Chicken Soup.