Dice the chicken breast, carrots, celery, and onion, and mince the garlic.

In a large pot, sauté the diced onion, carrots, and celery until softened, then add the minced garlic and cook for another minute.

Add the diced chicken and chicken broth to the pot, bring to a boil, then reduce heat and simmer until the chicken is cooked through and vegetables are tender.

Season the soup with salt and pepper to taste before serving.