In large bowl, beat 1/2 cup shortening and 1/2 cup butter with electric mixer until light and fluffy. Beat in 1 teaspoon vanilla extract. Gradually add 4 cups sifted powdered sugar, one cup at a time, beating well on medium speed. Scrape sides and bottom of bowl often. When all sugar has been mixed in, icing will appear dry. Gradually add 2 tablespoons of milk; beat at medium speed until light and fluffy.
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