Check the bottom and as soon as it starts to brown, flip it over. Swirl it in the melting glaze so you don't lose any.
Let it cool. We always use a knife to cut it - I get it really crispy. But if not, it makes it back to the pan for a little more high heat.
Just make sure to pick donuts that have a lot of glaze. If there is only a little on the bottom side, fry the top side first.