I save plastic lids from margarine or cottage cheese or the same size lids, and when making up hamburger patties (using a tupperware pattie form) I put a pattie on each lid, then top with another lid then another pattie. Freeze in a large plastic bag, when needing just a few patties at one time, it is very easy to separate and take what is needed.
I took all my excess lids and cut the same size circles out of them to use for making and freezing the patties. This saves space in my small kitchen. I cut 2 different size circles: a larger one for hamburger patties, and a smaller one for sausage patties. (I have a recipe for making breakfast sausage using ground chicken or turkey.) You're right about the convenience of using these.
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