Preheat oven to 350F. Melt margarine in a large skillet. Add onion, celery, and bell pepper. Sauté for 5 minutes. Stir in the poultry seasoning, thyme, and garlic powder.
Combine corn bread, vegetable mixture and vegetarian sausage substitute. Add broth. Toss gently. Spoon into 13x9 inch baking dish. Bake 30-35 minutes.