Mozzarella Cookie (Korean: 모짜렐라맛 쿠키, mo-jja-lella-mat kuki) is an Epic Cookie released alongside Olive Cookie in the second part of the Goddess of Eternal Gold update (v4.13). She is of the Magic type and her position is prioritized to the Middle. She was first introduced as an NPC in the The Lost Golden City update (v4.11). Mozzarella Cookie is the genius head of the Golden City's high-tech command chamber who presides over and actively develops the robotic Marzipan Cookies. Mellow, cunning, and enigmatic, she is an enthusiast of all sorts of games, especially those with calculable odds. She pursues everything new and unusual, regarding stagnancy and the status quo as dull.

There's a Cookie who keeps a keen eye on the Golden Cheese Kingdom from her Control Chamber. Why, it's none other than Mozzarella Cookie! This Cookie's been fixing errors left and right in the Golden City under the Big Cheese's command! From fishing out a Cheesebird's lost ring in the waterway to tracking down stray monsters, no bug is too big for this smart Cookie! At times, she controls her Marzipan Cookies in the middle of watching a monster fight or supercar race, but she's never made a mistake! She's hailed as the Brains of the Golden City—wielding her weapon of endless data flowing through the cheese network, but not even Golden Cheese Cookie herself knows what she's really up to. In the darkness of her Control Chamber, only the golden light from her system console reflects her innermost thoughts.

This stone holds a piece of Mozzarella Cookie's soul. It exudes a beguiling aura, always enigmatic and adaptable.