Brown the sausage in a skillet, stirring until crumbly; drain. Whisk the milk and eggs in a bowl until blended. Whisk in the dry mustard, salt, curry powder, dillweed and pepper. Add the sausage, cheese, mushrooms and onion and mix well. Fold in the bread cubes.
Pour the sausage mixture into a baking dish. Bake at 350 degrees for 40 minutes. You may prepare 1 day in advance and store, covered, in the refrigerator. Bake just before serving.