Trim bread into rounds to fit a 10-ounce casserole. Lightly spread with mustard. Place slice, mustard side up, in the greased casserole. Top with sausage and cheese. Cover with remaining bread, mustard side down.
Combine egg, cream or milk, seasoned salt, and hot pepper sauce. Pour over sandwich in casserole. Bake in a 325 degree F oven about 30 minutes or until egg mixture is set and sandwich is light and puffy. Serve at once. Makes 1 serving.