At 7 weeks I would stick to the more normal sounding chicken treats (ie fruits and veggies). Mine are 19 weeks and get anything that is not salty or spoiled. Last night was the remanents of corn on the cob, rice pilaf, and the fat and grisle from our steak. Nothing wrong with cooked chicken and I have also given mine the remanents of bbq pork ribs. Nothing but bones picked clean when they are done. Any type of left over vegetable matter that you don't eat is great. Ends of carrots, broccolli, cauliflower, corn, cooked taters, over ripe tomatoes (turkey went crazy for that, picked it up and ran off with it before the chickens even knew about it). There is a lot of stuff they will eat. You have to remember that it does NOT have to sound appealing to you. We have very little food waste since getting these birds. Although I have to remind the rest of the family to feed all those great leftovers to the chickens. The way I look at it is every pound of scraps I feed them is a pound of feed I DON'T have to feed them. With the scraps and free ranging all day I bet I am down to about a pound of food a day for 6 chickens and 1 turkey. At 19 weeks and I have used up one 50 pound bag of starter and just this week bought my second bag of feed. Now that I think of it I better see how much food they have tonight. Can't remember the last time I filled the feeder. I know they have food, just not sure how much is in the hopper.
As someone else said it's kind of like feeding pigs. They eat almost anything and mine seem hungry most anytime you have something for them.