When it comes to our eggshells, I never throw them away and like to feed them back to our hens.
I leave them overnight on the warming plate of our range, to slowly bake and dry out. I’ve tried baking them in the oven, which is fine, but would always get side tracked and forget about them ... burnt eggshells smell awful. 😬
Anyway, leaving them overnight works a treat, as they’re ready to go in the morning.
Once baked (You’ll know they’re ready as they become brittle and break easily), I place the eggshells in a strong plastic bag, gently crush by hand and then roll with my rolling pin. Perfect bite size pieces of shell to add to my chicken feed or grit ponds. My girls love it and it’s a good way to supplement their calcium. Happy hens ... 🐥😃