Put the butter in a microwave-proof bowl and microwave for 30 secs, until melted.
Transfer the butter in a large bowl and add the chopped chocolate. Mix until the chocolate has melted and you have a smooth mixture.
Mix in the sugar slowly, alternating it with the milk.
Mix all the ingredients until the frosting reaches a smooth rich consistency.
Use it straight away, or refrigerate for 15 min if you want a more solid texture.
Store in an airtight container for up to 4 days in the fridge.
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The information shown is an estimate provided by an online nutrition calculator. It should not be considered a substitute for a professional nutritionist’s advice.