I have a great butter cream recipe that looks fantastic on the cupcakes I do which keep their form , which for any cupcaker is paramount to a great cupcake. I have tried the Wiltons recipe and its great, but I dont like having to melt the copha to use in it.... ewww. SO I use the recipe I devised which is
250 grams butter, softened
4 cups of icing sugar
2 teaspoons of vanilla
2 tablespoons of milk
for chocolate butter cream add 3 to 4 tablespoons of chocolate ganache..... mmmm ganache.
To pipe the buttercream i use a big nozzle, lets not get too complicated, i wont go into sizes... just get a big one.... and swirl onto the cupcakes... :)