Heat the 2 tbsp olive oil in a large pot over medium heat. Add the 1 medium onion, 3 medium carrots, 2 celery stalks, and 3 garlic cloves. Sauté for 5-7 minutes, or until the vegetables are softened. Stir in the garlic and cook for 1 more minute, until fragrant.
2 tbsp olive oil, 1 medium onion, 3 medium carrots, 2 celery stalks, 3 garlic cloves
Pour in the 8 cups chicken broth and bring to a simmer. Add the shredded 2 cups rotisserie chicken, 1 tsp dried thyme, 1 bay leaf, and a pinch of salt and pepper. Stir to combine.
8 cups chicken broth, 2 cups rotisserie chicken, 1 tsp dried thyme, 1 bay leaf, 2 tsp salt, 2 tsp black pepper
Cover and let the soup simmer for 15 minutes, allowing the flavors to meld together.
While the soup simmers, bring a small pot of salted water to a boil. Cook the 1 1/2 cups alphabet pasta according to package instructions until al dente, then drain. Cooking the pasta separately prevents it from soaking up too much broth and becoming mushy.
1 1/2 cups alphabet pasta
Add the cooked pasta to the soup just before serving. Remove the bay leaf from the soup. Taste and adjust seasoning with more salt and pepper, if needed.
Ladle the soup into bowls, ensuring each serving gets a generous mix of chicken, veggies, and pasta.