I like this frosting because it is delicious, my sprinkles stayed on nicely, and it set to a nice hard-ish consistently so the cupcakes shall not be ruined in transportation.
75g dark/milk chocolate (as preference)
4 heaped tablespoons of Nutella (woo hoo!)
50g icing sugar
Melt chocolate, then add the other ingredients to the bowl whilst the chocolate is still warm and beat together until the mixture has a glossy texture. Use a palette knife to spread on the cakes. Try to only eat frosting from the bowl after all the cakes are iced (I failed at this).