Preheat oven to 375°F and lightly grease a 9x13-inch baking dish.
In a skillet, melt butter (if using) and sauté diced onion over medium heat until soft and translucent, about 5 minutes.
In a large mixing bowl, combine the cooked onion, bread cubes, and drained Veg-All Large-Cut Vegetables.
Pour in the broth, then season with sage, salt, and pepper. Toss gently until evenly moistened.
Spread the mixture evenly into the prepared baking dish.
Bake uncovered for 30 minutes, or until golden brown and slightly crisp on top.
Serve warm alongside your holiday feast.