Milky Way Cookie (Korean: 밀키웨이맛 쿠키, milkiwei-mat kuki) is an Epic Cookie released alongside Moonlight Cookie in the first part of the Invitation from the Slumbering Moon update (v4.0). She is of the Charge type and her position is prioritized to the Front.

Take a handful of star powder gathered from all over the Milky Way Galaxy, illuminate it with delicate moonlight—and voila! Meet Milky Way Cookie, the Slumbering Moon's faithful servant and the conductor of the Sugarcloud Express that will take you to your sweetest dreams and back. Don't be afraid and hop on: one sprinkle of Milky Way Cookie's star powder is enough for a colorful, vibrant dream-just like reality but better! Everything is possible in the World of Dreams, and accidents happen, too: every now and then, the train's floor disappears, and cars reshuffle randomly, leaving crowds of passengers in utter confusion. And right in the middle of the conductor's scheduled nap time! But professionalism never betrays, and there is no problem Milky Way Cookie can't sort out. Colorful hair neatly tied with a Star Jelly, conductor's hat on, and choo choo! The Sugarcloud Express will deliver you to your dreamy destination according to the schedule. Just make a wish upon a twinkling star...!

This stone holds a piece of Milky Way Cookie's soul. Choo choo! This train is headed to the World of Dreams! Off we go!

* Milky Way Cookie's Taiwanese voice actress, Lo Yiwen, also provides the voices of Mont Blanc Cookie, Cranberry Cookie, Institute Student, Capricious Wizard, the Cake Hounds, Shadow Assassin, and a younger version of Red Velvet Cookie. * Milky Way Cookie's internal name is "cookie0573".