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In a medium microwave-safe bowl, add the butter, unsweetened cocoa powder and whole milk.
Microwave for 45 seconds until simmering. If needed, continue in 15-second bursts.
Add the powdered sugar and vanilla extract and whisk until smooth.
Pour over cake or brownies while still warm and let set at room temperature for about 2 hours, or in the fridge uncovered for 1 hour.