You could break up some chalk and put it in- then they can draw as an activity after the hunt or during if you have the patience 😅 Or those little chicks if you trust your bub not to eat it straight away It's tricky cause the eggs are kinda small to fit appropriate things in for a 1 yr old. Good luck! I'm not putting anything in them- I'm lazy like that 😂
Coles have 6 packs of big egg shaped chalk that fit in the plastic eggs from Kmart. We used those to fill some for an egg hunt.
Maybe some of their favourite snacks /biscuits if you don’t want to use chocolate eggs?