Cake Frosting
["1/2 c. butter or margarine", "2 c. confectioners sugar", "1 egg white, beaten stiff", "1 tsp. vanilla", "2 oz. melted chocolate (optional)"]
["Cream shortening.", "Add confectioners sugar; add egg whites and beat well.", "Add vanilla or other desired flavoring.", "Beat until smooth; spread on cake."]
["butter", "confectioners sugar", "egg", "vanilla", "chocolate"]