Preheat your oven to 350°F (175°C).
Crumble the cooled vegan cornbread into a large mixing bowl.
In a large skillet, heat the olive oil over medium heat. Add the chopped onion and celery, and sauté until they are soft and translucent, about 5-7 minutes. Add the minced garlic and cook for an additional minute.
Add the sautéed vegetables, fresh parsley, sage, thyme, seasoning salt, and rosemary to the crumbled cornbread. Mix well to combine.
Gradually add the vegetable broth to the cornbread mixture, stirring gently until the mixture is moist but not soggy.
Lightly grease a baking dish with vegan butter or olive oil. Transfer the cornbread mixture to the dish, spreading it out evenly.
Bake in the preheated oven for 25-30 minutes, or until the top is golden brown and crispy.
Remove from the oven and let cool slightly before serving.