Preheat your oven to 350ºF and grease a casserole dish.
Melt the buttery spread in a large saucepan over medium heat. Add the onion and celery, and cook until soft, about 5 minutes. Add the poultry seasoning, salt, and pepper and stir to combine.
Stir in the bread chunks until evenly coated with the buttery mixture. Add the broth and stir to combine.
Transfer the mixture to your prepared casserole dish and bake for 30 to 40 minutes, or until lightly browned.