We had several of these mushrooms come up in a raised bed that was converted into a wood core bed last year. This mushroom grows well on wood covered with dirt, so you should see it popping up in Hugel beds. It's edible, but not a common table mushroom.

Don't eat anything you haven't properly identified. To do this you need books, and you need to know how to make a spore print. I would recommend the Audubon Society's Field Guide to Mushrooms (http://www.amazon.com/National-Audubon-Society-American-Mushrooms/dp/0394519922) . I picked one up at a used bookstore for 5 bucks. (along with several others)

Wiki: Pluteus_cervinus

Even with books, it is easy to get the wrong mushroom. Usually not deadly, often sickening. Work with an experienced friend or local mushroom society. There are a few that most people can identify from books: Turkey tails, shaggy manes, and a few others. They are often listed in books as 5 easy mushrooms, etc.
John S
PDX OR