Butter dish. Butter bread on both sides and lay in casserole dish. Cook sausage and break in little pieces. Drain.
In blender, blend eggs, milk, mustard, Worcestershire, salt, NOT cheese. Grate cheese. Sprinkle sausage over buttered bread, then spread cheese, then pour over cheese the egg mixture. Refrigerate overnight. Bake at 350 degrees for 30-40 minutes. Serves 12 or more.