The recipe called for cocoa and melted bittersweet chocolate. This gave them a wonderful, almost crispy, texture that was different from the chocolate cupcakes that I have made. Adding buttermilk to the mixture kept it from becoming too dry.
The glaze is also made with bitterswet chocotate. If you like dark chocoate, and I do, this ganache-like topping is for you. My family would have liked something a little sweeter. The next time I might use a chocolate buttercream.