Rich Pound Cake
["9 egg whites (1 1/4 c.)", "3 c. sifted all-purpose flour", "1 tsp. baking powder", "1/2 tsp. salt", "2 c. sugar", "9 egg yolks", "2 c. butter or regular margarine, softened", "2 tsp. vanilla extract", "confectioners sugar"]
["In large bowl of electric mixer, let egg whites warm to room temperature, about 1 hour.", "Preheat oven to 350\u00b0.", "Grease and lightly flour 10-inch tube pan.", "Sift flour with baking powder and salt; set aside.", "Beat egg whites until foamy at high speed with electric mixer.", "Gradually beat in 1 cup sugar, 1/4 cup at a time, beating after each addition.", "Continue beating until soft peaks form when beater is slowly raised.", "Turn in medium bowl."]
["egg whites", "flour", "baking powder", "salt", "sugar", "egg yolks", "butter", "vanilla extract", "confectioners sugar"]