Haven't had a chance to use my time for practical reasons (e.g. mushroom foraging). Instead, I've been hampered by work. Hope to get into the woods this Memorial Day weekend and make up for lost time. These Agrocybe have been popping up by the hundreds in garden mulch spread around the winery where I work.
I'm tempted to say this is some variant of Agrocybe praecox. Others have suggested A. dura. The striations near the top of the stem are distinctive and eye-catching. Said to be of little to no culinary value, I didn't even give it a try. But, those deep fissures in the cap look like they could soak up a batter or sauce... Some salted garlic butter, maybe? I bet there must be some way to make these things taste good.