INGREDIENTS
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2 1/2 sticks (300 g) unsalted butter, softened to room temperature
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2 cups (240 g) powdered sugar, sifted, plus more as needed
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1/3 cup (30 g/ 1 oz) cocoa powder, sifted
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1 teaspoon pure vanilla extract
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170g (6 oz.) dark chocolate (bittersweet or semisweet), melted and slightly cooled
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1/4 cup (60 ml) heavy cream
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Pinch of salt, optional