These chocolate cupcakes from Culinary Concoctions by Peabody and are absolutely delicious! I have made them before, but it was before I got a blog. :) The cupcakes have a great texture and would hold together well for any filling you wanted to use (as Peabody does). I use the peanut butter filling as a frosting though, and believe me, these cupcakes are super rich even without the chocolate frosting (though I'm sure that way would be totally delicious as well!). These are definitely the sort of cupcakes where I can only eat one in a sitting, but they are totally worth it. Yum! Sort of like a Reese's Peanut Butter Cup in cupcake form.
I didn't make any changes other than using the filling for frosting and omitting the original frosting, so you can find the recipe here.