•Clean the mushrooms.
•Chop the mushrooms into slices or dice. You can always chop them up smaller when you use them. For now, just aim for pieces that are no more than 1/2-inch thick.
•Spread the mushroom pieces in a single layer on a cookie sheet or large plate. It is okay if the pieces touch, but they should not overlap. Freeze for 2 hours.
•Transfer the frozen mushrooms to freezer containers. Because they were frozen in a single layer first, the pieces will stay loose and individual in the containers.
Freezing Cooked Mushrooms