I told my son I was going to figure out how to cook chicken feet as part of our dinner instead of just using them for stock. He got this horrified look on his face and told me very bluntly he'd be eating at a friend's house that night.Teenagers can be so much fun to mess with.![]()

I lived in Ecuador for a while, and they always tried to hide the chicken feet from me so I wouldn't feel ill. I tried to explain, I'm cool with that! Bring it on! What Ecuador can do with both potatoes and chicken feet ... nom nom. Of course a lot of places are even more into chicken feet than Ecuador ...
Dad's doctor told him to eat glucosamine supplements. He whined about the price. I showed him the jelly-like stock I make with bones and feet, which is essentially "found food," so "free" ish, and FULL of the stuff. He's more of a fan of soup now.

I haven't tried duck feet yet, @hellbender , but duck eggs make THE BEST mayonnaise.
For hearts and gizzards, I like to make a Puerto Rican pickled green banana salad (Guineitos en Escabeche) the day ahead of processing chickens, then on processing day take the hearts and gizzards and fry them a bit and mix them in. Oh yeah, that's GOOD!
I like the livers in a cream sauce over pasta. Or a bit curried cooked in butter with spinach.
These things are a BIG part of why I wanted to start raising poultry.