Could it have been... Mine? :-D
So, for my birthday, out came The Book! And from the book: Chocolate cupcakes, with chocolate frosting.
This recipe involved lovely quantities of butter. And cocoa. And made the BEST batter I have EVER tasted!
The batter was surprisingly simple to make, even though it wasn't the traditional 'beat butter and sugar, blah blah"... You actually mixed butter, oil and cocoa over heat until everything was melted and combined, and then mixed that with a flour/sugar/baking stuffs mix. Mix in some buttermilk, vanilla and eggs (1 whole, 1 yolk) and you have 12 lovely cupcakes!
The icing was made in a very similar way - Butter, cream, icing sugar and cocoa. Combine over heat. Then you let it cool until it's thick enough to not drip.
But for the ease of the recipe, the results are REALLY, truly wonderful. No mix beats this, I tell you.
One note, though: Those giant confetti sprinkles? Adorable! And not very tasty...