Try scrambling an egg and then putting it through a food chopper to mince it super fine, you can add a bit of wild finch seed if you want to keep it from clumping. Then you can feed it to the littles either in a dish or scattered on an old pillowcase on the which is a solid contrasting color to the treat. It won't take them long to figure out how to scratch for their treats. I think it is good exercise for little legs too.
Great idea! Thanks, I'll try the scrambled egg. She's not interested in mealworm or plain yogurt, which both are big hit for the other 5.