If you prefer, you can freeze them first on a tray as with the raw mushrooms to keep them separated. When you are ready to use your frozen mushrooms, Chef Rhonda says you can cook with them still ...
even mushroom stalks. It can all go into making an excellent stock when you have time. Cooked potatoes such as par-boiled roast potatoes or buttery mash will freeze well, but raw potatoes will not.