Cream butter and sugar well, add eggs one ata time, and beat again. Add sifted flour, cornstarch and bakingpowder. Put in small spoonfulls on greased cookie sheet and bake 8 - 10 minutes at 400 degrees. When cold spread rasberry jam on flat side and stick together with another one. (hope you understand what I mean ?), and sprinkle with sifted powdered sugar. MMMMMMmmm one of my favorites.