Eating 'wild' mushrooms goes against the common sense I learned growing up in America, but these 'Field Mushrooms' are actually the same ones you buy in the supermarket. I was a bit sceptical, but after sautéing them in butter and soy sauce with a bit of onion and garlic, I am now convinced that they are indeed edible and tasty.
It's always good to be sure of the identity of mushrooms before eating them. But theses Field Mushrooms have a very specific look about them and would be nearly impossible to confuse with any other kind.