H has had to work all weekend, so on Sunday I made him a chicken pie and a massive bowl of mashed potato to cheer him up. There was some mash left so this morning I made mashed potato bread in the bread maker. Which is a real thing by the way (for example). I used about half a pound of mash to somewhat over a pound of white flour, and quite a lot of sugar to pep the yeast up a bit. I've just had a slice and it's worked out well. It's very soft and spongy, rather fragile to cut and spread.