- Preheat oven to 375°F (190°C). Grease a 9x13-inch baking dish. 
- Sauté vegetables – In a skillet, melt butter over medium heat. Add chopped celery and onion, sautéing until soft (about 5 minutes). 
- Mix the base – In a large mixing bowl, combine shredded chicken, crumbled cornbread, and sautéed veggies. 
- Season & moisten – Stir in salt, pepper, poultry seasoning, and sage. Slowly pour in chicken broth while mixing. Add beaten eggs and mix until fully incorporated. 
- Bake – Transfer the mixture to the prepared baking dish and spread evenly. Bake uncovered for 40-45 minutes or until golden brown and set. 
- Rest & serve – Let it rest for 10 minutes before serving. Enjoy warm!