Don't eat it. As someone else already posted, that's a species of Argaricus. But it's not one of the edible variety. The chocolate-brown gills (when mature) is an easy identifier. It may be A. silvaticus. This species won't kill you but they don't taste very good and you may end up vomiting for a day or two.

I have them coming up all over my yard too.

There are several very good species of Argaricus including A. campestris and A. augustus. Both of these are coming up right now. Be sure you know how to identify them before you eat them.