Cream the shortening and sugar,add egg and sour milk.Add all-bran and let soak until most of the moistkure is taken up.Sift floour with baking powder,soda and salt and add to first mixture,stisrring only until flour disappears.Fill greased muffin tins 2/3 full and bake in a moderate oven 400 degrees for 20 to 25 minutes.