Kindle
From 2003, so the muffins are stale -- but the image is everfresh. Link, and here's a more recent batch.
What is a Turing Machine? Link to an explanation of the variety not produced from blueberries, sugar, and flour. This is the hobby of Duke University associate computer science professor Susan Rodger. She's posted more cool photos of nerdy baking experiments here. (Thanks, Isara)