How to Make It
Heat oven to 400° F.
In a large skillet, cook the sausage, crumbling it with the back of a spoon, until cooked through, about 6 to 7 minutes. Transfer to a bowl and set aside.
Wipe out the skillet, add the oil and heat over medium heat. Add the onions and cook until golden brown, about 8 minutes. Add the carrots and celery and cook until soft, about 6 minutes. Add 1 1/2 teaspoons salt, 3/4 teaspoon pepper, the parsley, and thyme and cook for 1 minute.
In a large bowl, combine the bread, vegetables, sausage, chestnuts, and broth. Transfer to a baking dish. Bake for 20 minutes, until heated through.