 if I'm doing something that I want to stay individually frozen that's easy to remove from the freezer, is to actually place it on a parchment-lined cookie sheet and stick in the freezer until it's frozen solid and then transfer it. You know, the heavy-duty freezer bags are good. You can use food-safe, rigid plastic containers that you can take the lid off and get out what you need and then put it back in the freezer.