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Photo, Erik Putz.
1 cup unsalted butter, softened
3 cups icing sugar
1/2 cup cocoa powder, sifted
2 tsp vanilla
1/2 tsp salt
1/4 cup 35% cream
BEAT butter in a bowl, using an electric mixer on medium, until smooth, 1 to 2 min. Gradually beat in icing sugar and cocoa on low, scraping bottom and sides of bowl until just combined. Add vanilla and salt and beat on medium-high until very light and fluffy, 3 to 4 min. Add cream and beat 1 min.