Posie Cream Frosting
["1 c. shortening, softened", "1/4 c. margarine", "3 c. sifted confectioners sugar", "1 1/2 tsp. vanilla", "1/8 tsp. salt", "2 to 3 Tbsp. cocoa (may be added to make chocolate frosting)"]
["In a large bowl, thoroughly mix shortening and margarine. Then beat in sugar, vanilla and salt until fluffy and light and spreading consistency.", "Store covered at room temperature."]
["shortening", "margarine", "confectioners sugar", "vanilla", "salt", "cocoa"]