I can’t stand cottage cheese but use it in egg bites since it’s blended in and it’s only for structure- I can’t tell it’s there. I use the silicone lid to keep condensation out. I would say to make absolutely sure the lids are silicone if using to cook- soft/floppy and not plastic- stiff/hard. Some sets online include plastic lids just for the purpose storage. If plastic, you can just cover with some foil.