1/2 c. shortening
1/2 c. sugar
1 egg, yolk, beaten
3 tbsp. milk
1 1/2 c. sifted flour
1 1/2 tsp. baking powder
1/2 tsp. vanilla
1 oz. chocolate, melted

Cream butter, add sugar gradually, then egg yolk; beat well. Sift flour, baking powder, pinch of salt and add alternately with the milk and vanilla, to the first mixture. Mix well. Divide dough in half; to one part add chocolate melted and cooled. Spread or pat each part same size, into oblong thin sheet on greased cookie sheet. Place in Dual Temp until cold and firm. Place chocolate dough over white dough. Roll tightly, as for jelly roll. Wrap in waxed paper and place in Dual Temp several hours or overnight. Slice very thin. Bake on greased tins at 375 degrees for 10 to 12 minutes.