This could be considered a frugal treat, but really it is too . . . too . . . much to be anything but completely indulgent.
You take a day old glazed donut (it can be a completely fresh one as well). Like this one.
Melt some butter (about a pat of butter) in a skillet and then fry the donut in the butter on both sides.
When it is lightly toasted on each side,
just put it on a plate and eat it while hot. With a fork. You will see why.
The inside gets all soft, like when it was fresh. The glaze caramelizes into a crispy crunch. You could just heat it in the microwave but then you wouldn't get the crisp sugar shell.
As a safety precaution, I need to tell you that the melted sugar is extremely hot. Please be careful.