Preheat Oven: Preheat your oven to 350°F (175°C) and grease a 7x11-inch baking dish.
Prepare Cornbread: Crumble the cornbread into small pieces in a large bowl.
Sauté Veggies: In a skillet, melt the butter and sauté the onion and celery for 5-7 minutes until softened.
Combine Ingredients: Add sautéed vegetables to the cornbread. Stir in the beaten eggs, chicken stock, dried sage, salt, and pepper.
Bake: Pour the mixture into the greased baking dish and bake for 30 minutes or until golden brown on the edges.
Serve: Let cool for a few minutes before serving.