Slice and dehydrated some!

Dehydrated mushies can be kept (long shelf life) to add to meals. Or put them through a food processor to make a powder (takes up much less space, if that’s an issue for you) which is great for extra flavour in soups, sauces, casseroles, etc.

Prequel to Wall-E.

You can boil them to extend shelf life. Once a food is cooked, you have another week (approximately) to use it before it goes off - maybe a little longer for eggs still in unbroken shells. Boil them, store them in the fridge, and add them to meals over the next week.