Preheat the oven to 350°F.
Place the bread cubes evenly on a baking sheet. Melt half the butter and pour over cubes. Bake until lightly golden in color and slightly dried out, about 15-20 min.
In a large skillet, melt the remaining butter over medium heat. Add the sausage and cook for 5 minutes, crumbling the meat with the back of a spoon. Add the onion, cook until tender and the meat is browned, 7-10 minutes. Transfer mixture to a large bowl and let cool.
Add the toasted bread cubes, stock and eggs to the bowl and mix well (use your hands if you like -- it’s fun!). The mixture should be moist but not soggy; add a little more stock if you like your stuffing wetter.