Freeze Unused Egg Whites and Yolks
If a recipe calls for just egg whites or egg yolks, don’t throw the remaining part down the drain. You can freeze both yolks and whites for future use.
To freeze egg whites, use a plastic ice cube tray. Put one white into each cube space and freeze. Pop the egg-white cubes out of the tray and store in a labeled, ziplock plastic bag in the freezer.
To freeze yolks, add a pinch of sugar or salt to each one to prevent it from coagulating, then freeze in the same way as the whites.