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In large bowl, combine the butter, marshmallow creme, salt and vanilla.
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Use an electric mixer with the whisk attachment on high to beat until well mixed.
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Add the cocoa powder and mix on low until just incorporated.
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Add the confectioners' sugar and mix on low until just incorporated, stopping to scrape the side as needed.
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(Frosting can be refrigerated. Allow 10-15 minutes after removing from refrigerator before proceeding).
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Transfer the frosting to a large plastic bag or piping bag fitted with a large icing tip.
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Pipe the frosting into small paper muffin cups, shot glasses or onto spoons arranged on a serving platter.