If player acts nice on server, etc. Admin might give player a cookie and it would write to chat like Have a Cookie If player does something stupid etc. admin could take x cookies from him...
if u want a meal plugin i recommend "Meals" it configurable to what each person gets. it gives food in the morning/noon/late evening
Why not use iconomy but instead of money change to currency to cookies. This means it can be checked to see how the person if performing. There is also another rater plugin somewhere else