Preheat your oven to 350°F.
Crumble the cornbread into a large bowl.
In a separate bowl, combine chicken broth with celery, bell pepper, onion, butter, garlic, thyme, sage, black pepper and salt. Mix until all ingredients are fully combined.
Pour the vegetable and chicken mixture into the bowl containing the cornbread, mixing until everything is well incorporated.
Transfer this mix to a greased 9×13 baking pan.
Place in the preheated oven and bake for 30-35 minutes, or until golden on top.