Buttercream Frosting
["6 c. powdered sugar, sifted and divided", "3/4 c. butter, softened", "1/4 c. vegetable shortening", "6 to 8 Tbsp. milk, divided", "1 tsp. vanilla"]
["Combine 3 cups powdered sugar, butter, shortening, 4 tablespoons milk and vanilla in large bowl.", "Beat with electric mixer until smooth.", "Add remaining powdered sugar; beat until light and fluffy, adding more milk, 1 tablespoon at a time, as needed for good spreading consistency.", "Makes about 3 1/2 cups."]
["powdered sugar", "butter", "vegetable shortening", "milk", "vanilla"]