Arrange all the ingredients in the bowl of a slow cooker. Place the chicken first, then layer vegetables around it. Finally, place the herbs on top. Pour in broth and vinegar. Reserve the zucchini noodles aside.
2 pounds chicken breast, 1 small onion, 1 clove garlic, 2 stalks celery, 1 cup carrot, 2 tablespoons raw apple cider vinegar, 1 tablespoon parsley, 1 tablespoon rosemary, ½ teaspoon salt, ¼ teaspoon ground black pepper, 8 cups chicken broth