Blarney Stone Bars
["4 egg yolks (save 1 for frosting)", "1 c. sugar", "1 c. flour", "dash of salt", "1 1/2 tsp. baking powder", "1 tsp. vanilla", "1/2 c. boiling water", "4 beaten egg whites", "2 1/2 c. powdered sugar", "1/2 c. melted butter", "1 egg yolk", "vanilla"]
["Add enough milk to spread.", "Sprinkle with chopped walnuts or salted peanuts."]
["egg yolks", "sugar", "flour", "salt", "baking powder", "vanilla", "boiling water", "egg whites", "powdered sugar", "butter", "egg yolk", "vanilla"]