This is a delicious dish, but the times in the instructions are strange. For example, if you microwave anything for 40 minutes you won't end up with something edible. Perhaps that was the author's estimate as to how long it takes including the peeling and slicing? And it doesn't take 10 minutes to beat the sugar/butter etc. into the potatoes. Aside from that, it's yummy. I don't cool the potatoes or drain the water off the potatoes before mixing them, and prefer to use brown sugar both in the potatoes and in the topping.