Preheat oven. Set oven to 350°F (175°C) and lightly butter your baking dish.
Cook vegetables. In a large skillet, melt butter over medium heat. Add chopped onion and celery, then cook for about 5 minutes until soft and fragrant.
Mix the stuffing. In a large bowl, combine the Pepperidge Farm stuffing mix with the cooked vegetables. Pour in chicken broth gradually while stirring gently until the bread cubes are evenly moistened.
Add herbs and seasonings. Stir in parsley, sage, or thyme if desired. Taste and adjust with salt and pepper.
Bake until golden. Transfer the mixture to the prepared baking dish and bake uncovered for 30 to 35 minutes until the top turns crisp and golden.
Serve warm. Serve immediately as a side dish with roasted turkey or chicken, creamy mashed potatoes, or the Old Fashioned Vegetable Beef Soup Recipe for a hearty family meal.