Steve: Only cook them in a hot dry pan. Either let the water that comes out evaporate or pour it out. If you want butter and onions with them do it after all the water comes out. And yes they lose a ton of mass.
It took me a while to learn that one but the flavor is much better if you do it that way.
I use the dehydrator on what I don't use but that is a poor substitute. Will try NWP's link and can some.
When I get a bunch I:
1 eat over meat
2 eat in salad
3 make a couple of gallons of mushroom soup and freeze in tupperware. I highly recommend this.
I don't have a recipe for the soup but...
mushrooms,heavy whipping cream,butter,bay leaf,pepper and chicken or beef stock. Add some other stuff if you have it laying around. It's really good but probably not for heart patients.