One of the quickest ways to decorate any dessert. All you need is a bar of chocolate (milk, dark or any flavor of your choosing). Take any metal cookie cutter (circle [shaped] cutter works best) or a vegetable peeler.

Bar of chocolate
Take the bar of chocolate and with your palm, rub the surface to soften.

Take your peeler or cookie cutter and start shaving through the length of the bar, or where you have softened the bar.

As you scrape with your cutter, it will produce a curlier shaving, whereas, the peeler will result in smaller, jagged shavings.

Top any cake or mousse with shavings and it'll add a great touch to your sweet treat!