Sour Cream Drop Cookies

Mix together ½ c shortening, 1 ½ c sugar and 2 eggs.  Stir in 1 c sour cream and 1 tsp vanilla.  Sift together and add 2 ¾ c flour, ½ tsp soda, ½ tsp baking powder, and ½ tsp salt.  Chill one hour.  Drop on lightly greased baking sheet and bake for 8-10 minutes at 425°.  Frost with powdered sugar icing and sprinkle with chopped nuts.