You can't really tell from this photo, but they're really tiny, about an inch square, so just right for bento. The 'muffin cups' they're in are actually truffle sized.
Here's the recipe. The only thing I did differently is that I cut the recipe in half and used a wide loaf pan instead of a square pan, and I chilled them in the fridge when they were done so that I could cut them really small without breaking them.
Hopefully I will get better at making fancy desserts. I've been checking out Amazon for some good books, I'll let you know what I find!