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.
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.