Chocolate (Irish) Potato Cake
["4 sq. chocolate", "1 c. mashed Irish potatoes", "4 eggs", "1 c. butter", "2 c. sugar", "1/2 c. milk", "2 1/2 c. flour", "4 tsp. baking powder", "1 tsp. vanilla", "1 c. chopped nut meats"]
["Beat butter and sugar together until creamy, then add mashed potatoes, melted chocolate, egg yolks (beaten), milk, flour, baking powder, vanilla, nuts and whites of eggs, beaten stiffly. Mix carefully and bake in a moderate oven (350\u00b0)."]
["chocolate", "mashed Irish potatoes", "eggs", "butter", "sugar", "milk", "flour", "baking powder", "vanilla", "meats"]