The Pizookie is a yummy fusion of Ice Cream and a Cookie. They are that one item that makes a restaurant special, specifically, it's BJ's special dessert item.
They were first made when Cookie Monster visited raided a local BJ's near You, but dropped one of his Ninja Throwing Cookies into some Ice Cream, he was disgusted, but when he left they decided to sell it. It comes in many flavours too.