I use a couple of different methods when freezing monster cookies. One option is to fully bake the cookies, wait until they are cooled and then place in an airtight bag and place them in the freezer. The other option is freezing the dough. To do this I like to scoop each dough ball and place it on a cookie sheet. I put the cookie sheet in the freezer and once the dough balls are frozen I place them all into an airtight container and put them back in the freezer. I like to freeze them like this so the dough balls don’t all stick together.