
Sift, or sieve, icing sugar and cocoa separately before weighing the icing sugar and measuring out the cocoa then sift the two together to blend.
In bowl of stand mixer fitted with paddle attachment, beat butter at medium speed until completely soft and smooth. Add the vanilla. Reduce mixer speed to lowest setting and gradually blend in the icing sugar and cocoa, adding enough liquid (a tablespoon at a time) to make smooth icing of desired consistency. Stop as necessary to scrape down sides of bowl. After all of the dry ingredients have been added, increase mixer speed to medium and beat about 45 seconds longer. Spread icing evenly over chilled square. Refrigerate for about 40-45 minutes to set and firm up icing then remove square from refrigerator and cut into squares of desired size.
Yield: One 9” square
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