Finely chopping the chocolate results in small shards that won't sink in the batter. Use a spring-loaded ice cream scoop to transfer batter to muffin cups with ease.
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Be sure cupcakes are completely cool before decorating, to avoid melting the frosting.
Icing on the (Cup)Cake
You don't need fancy supplies to frost these treats -- a zip-top bag makes a fine stand-in for a pastry bag. Place it in a tall glass so it's easier to fill.