I doubt that they would freeze very well.

Mushrooms do not usually freeze well as they lose too much water

There’s awesome stuffed mushrooms on here. I think if you froze them, they would be a soggy mess on defrosting.

The stellar stuffed mushrooms on this site are savoury and full of cheese flavour.

I have made stuffed mushrooms with chicken livers and wrapped in bacon – but never have had enough left over to even think of freezing.

I have found awesome recipes for stuffed mushrooms in the recipes section and they have not lasted long enough to freeze.