Bread Stuffing With Mushrooms and Bacon

1 tablespoon unsalted butter , softened 10 cups unseasoned dry bread cubes 8 ounces bacon , cut into 1 inch pieces 1/2 cup pecans , toasted rough chopped 1[...]

1 1/4 lbs sourdough bread, 1/2-inch cubes 12 slices bacon , 1/2-inch pieces 2 medium leeks , chopped 3 cups celery , chopped 8 ounces mushrooms , sliced 1 1/2[...]