Chocolate Yule Log
I thought mine had too much buttercream, so I'd probably use two-thirds for this and save the rest for cupcakes.
If you have a favorite frosting or filling, it will work here. As long as you can slice it later, pretty much anything goes. You can also add a splash of milk to achieve a light, fluffy buttercream.
You can also drizzle the baked sponge with many delicious, possibly adult beverages, such as dark rum, kirsch, or raspberry liqueur, just to name a few.