1 1/2 c. self rising flour
2/3 c. granulated sugar
2 oz. plain chocolate, melted (or 4 tsp. cocoa may be used)
1/2 tsp. salt
1/ c. cooked mashed potatoes (instant may be used)

Cream butter and sugar with potatoes. Then add melted chocolate or cocoa. Add beaten eggs alternately with flour and salt. Finally, pour in milk and mix well. Grease 9 inch square pan. Pour mixture into pan and bake for 20 to 25 minutes. Top will be firm and spring to the touch when cooked. Let cake cook and turn onto wire rack. Frost when completely cooled.