From my perspective, this is a good thing because I’d take a clean razor blade and slice it clean through starting from
the underside. Now you’ll have two. I’ve done this 50+ times with zero fatalities. Of course there may always be a first, so…cut at your own risk.
1) turn shrooms upside-down for a few mins and with gravity the foot loosens and you can use a tooth of a plastic fork to peal the rest of the foot
2) same as #1 above but use an ice chip from your freezer for a difficult DEEP ANCHORED foot. place ice chip on and around the foot and the shroom will loosen it's grip