For these delicious cupcakes I slightly adapted a recipe for Tiramisu Cupcakes from The Hummingbird Bakery Cake Days book. It's a lovely book, with great photos for each recipe and step by step directions.
Basically its a vanilla sponge, with a piece cut out and a coffee & Kahlua syrup (I replaced the Kahlua with Baileys - that was the slightly adapted part!) poured into the hole. On top of that a marscarpone/double cream/icing sugar & Kahlua mix (I used Baileys again here!) is spooned on, and then the piece of cake is replaced, after it has been soaked in the coffee liquor syrup. The cake is then frosted with the remaining mascarpone mixture.
They were absolutely delicious, but the general consensus was that you couldn't eat more than one!!