Use whatever spices you like on the mushrooms; they’ll take on any flavor.
I always use LESS of the Ranch Mix than the recipe calls for and I am making a TON at a time - usually two crock pots full to start, because the mushrooms shrink down, then I transfer them to one to take to the gathering.
You can also just use the butter and no spices. I’ve had those as a side with a steak before and remember being impressed. ;)