Yeah I used to dry out entire sheets of them in the oven way back in the day, after picking grocery bags full as a teen year after year every season. I found many different ways to dry them out, like using heaters, or even setting next to wood stoves. Setting them over the floor vents and using the propane furnace, that is usually going off all the time in Oct anyway.. Trying not to stink the house up and get caught.. We always used what we had, and it wasn't a new dehydrator off amazon unfortunately..
I've puked up my fair share of badly dried out (almost black looking).. and probably even rotten psilocybes over those years, before I knew the importance of properly drying them and how to. For sure, bad mushrooms are no fun.. blah!