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Beat butter, shortening, 3/4 cup powdered sugar and vanilla in large bowl at high speed .
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Add flour, 1/2 cup malted milk powder and cocoa; beat at low speed until well blended.
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Refrigerate several hours or overnight.
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Preheat oven to 350.
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Shape slightly mounded teaspoonfuls of dough into balls.
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Place dough balls about 2 inches apart on ungreased cookie sheets.
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Bake 14 to 16 minutes or until lightly browned.
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Meanwhile, combine remaining powdered sugar and malted milk powder in medium bowl.
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Remove cookies to wire racks; cool 5 minutes.
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Roll in powdered sugar mixture.