You can find the cupcake recipe online but I have been looking and looking for the buttercream recipe, and it is no where.  If I were Mandy B, I would lock my recipe up to, if it were as good as hers;and swear my employees to secrecy, if I told them what was in it, at all.  If you visit Chicago and do a lot of begging at Mandy B's, maybe you might just wear her down, and she would give you a few hints about why it is so good.  This person says that they have her cupcake recipe: http://adventuresincupcakes.blogspot.com/2008/01/adventures-in-sweet-mandy-bs-chocolat and this person has tricks to make the buttercream recipe even better: http://nataliecakes.wordpress.com/2007/01/27/sweet-mandy-bs/I would see if you could communicate with nataliescakes and see if she will give up the buttercream mystery recipe.  She sounds like she might be approachable.