Preheat oven to 400 degrees. Put flour, baking powder, baking soda, salt and sugar in to large mixing bowl. Cut in the margarine or butter.  The mixture should have a mealy texture.

In a small bowl combine sour cream and egg until blended.  Make a well in the middle of the dry ingredients and pour sour cream and egg mixture into the well.

With a spoon, blend together until all dry ingredients are moist.  DO NOT OVER MIX! - the dough will be very sticky.

Drop generous tablespoons of dough onto a greased cookie sheet.  You may need another spoon to push the dough off the spoon.  Space about 3 inches apart.  Bake 10-12 minutes or until golden brown.