I am hosting a cookie making challenge (like chopped or whatever) at a family gathering this coming weekend. They can make cookies or squares. I am trying to come up with three interesting/unique 'secret ingredients' that are not too silly (we still want the cookies to taste good!). \n\nI was thinking of things like twinkies, carrot, etc ... but I am kind of stumped. The teams will have access to basic cookie dough ingredients, plus most cookie add-in things from my pantry.\n\nAny ideas?