I have never smoked mushrooms but then alot of things that I have seen here that I haven't smoked yet. The key works is YET. But I like the shrooms that Erain did they looked really good too specially with the marshmellows. J/k
I smoke shrooms all the time. I toss them with EVOO and whatever seasoning blend catches my eye that day. If I'm going to stuff them I remove the stems and place them in the smoker, on the rack cap up for about 20-30 mins to allow most of the juice to drip out. I then flip them over, add the stuffing and finish them in the oven under the broiler.
If I'm smoking them as a side dish or to make a sauce or stock with, I toss as above and put them on a sheet pan with a bit of white wine and smoke for about 20 mins if a side or until they just start to shrivel up a but if for sauce or stock. I do these on a pan in order to catch all the juices to add to the sauce/stock.
I do them with my ABT's all the time. My wife can't take the heat from ABT's, so I put some of the filling in white button cap mushrooms, wrap in bacon and toss on with the ABT's. They are really, really, good!