Well our chickens have alot of favorite treats like.....
1. grasshoppers and grubs seasonally of course
2. mealy worms especially in the winter when you have to get them at a bait shop
3. sunflower hearts
4. table scraps like spaghetti noodles and such , you have to be careful not to include too much salt
5. cooked rice but don't overdo it , it will soften shells
6. eggs and eggshells. We cook them up so they don't get used to eating raw eggs
7. chicken scratch
8. string cheese just don't overdo it, it contains salt BUT they will jump to get some
9. watermelon. especially in hot weather actually melon fruit or rind
10. fresh sweet corn straight from the garden its how we get rid of small ears that aren't worth saving