Put your soup pot or dutch oven on medium-high heat, while it heats, pound chicken breast to even thickness and salt both sides.
Once the pot is hot, add oil, then the chicken breast. (If using instant pot, add chicken and set to high pressure, 12 min, natural release 10 min.) Cook until 160℉, about 6 minutes per side. Remove to a plate when finished.
1 ½ lbs boneless chicken breast, shredded (or rotisserie), 1 tablespoon olive oil
While the chicken cooks, wash and prep all vegetables. Set aside green parts of the onions for serving.
1 cup carrots, small dice, 1 cup celery, small dice, 1 cup green onions, sliced (any onions will work), 2 cloves garlic, peeled and minced
Once the chicken is finished, add vegetables and garlic to the pot, cook 6–8 minutes, stirring occasionally until they begin to soften. Make sure to scrape up any brown bits left from the chicken.
Meanwhile, zest and juice lemons into a medium bowl. Reserve a small amount of zest for garnish.
½ cup fresh squeezed lemon juice, about 4 large lemons
Once vegetables have softened, add stock, bay leaves, herbs, salt and pepper. Bring to a boil. Once boiling, add orzo and cook for 8–10 minutes.
8 cups chicken or vegetable stock, 1 cup orzo, 2 bay leaves, 2 tablespoons minced fresh herbs, dill, rosemary, or parsley work well, salt and pepper, to taste
While the orzo cooks, add eggs to the lemon juice and whisk to combine. Carefully add hot broth, one ladle at a time, while constantly whisking. Add until the lemon egg mixture is steaming. Shred chicken breast.
2 large eggs
Once the orzo is finished, turn off heat, add chicken, then stir in lemon and egg mixture.
To serve, ladle soup into a bowl, top with lemon zest, green onions, and red pepper flakes, if desired. Enjoy!