Preheat the oven to 300°. Spread out the cubed bread on a cookie sheet tray lined with parchment paper and bake in the oven for 25 to 30 minutes or until crisp and firm. Set aside.
While the bread is baking add a ½ stick of butter to a large frying pan or rondeau over medium-high heat and cook the sausage until broken up, lightly browned, and cooked throughout.
Remove the sausage from the pan or pot and add the remaining ½ stick of butter. Add in the onions and cook for 4 to 5 minutes or until lightly browned.
Transfer the cooked vegetables, sausage, and baked cubed bread to a very large bowl. Next, add in the herbs, salt, pepper, and chicken stock and mix gently until combined.