Approach Cookie's dump pile ( -109, -125, 630 ) /waypoint -109, -125, 630 by night. Night begins at 8 pm game time. (Sitting by it waiting for night will not work, you must walk past it at night time to get update.)
Examine the dump pile and a lvl 76^^ non-aggro mob called Cookie's Monster will spawn on top of the dump pile.
Unless everyone in your group approaches it at night, you will not get the update that enables you to examine it. Once everyone receives the update, have one person examine the pile to spawn the monster. Once it is dead, everyone may take turns looting the food from the chest it drops. (Killing the monster once for each person in your group is no longer necessary.)