Cookie Fortress.
The Cookie Fortress is the Cookie King's fortress that replaced Whomp's Fortress in one of MarioMario54321's videos. It is where Mario first meets Lily. After Mario and Lily defeated the Cookie King, the fortress disappeared, leaving Whomp's Fortress covered in cookies. Soon MM and friends used the cookies for a scavenger hunt. Later, the Cookie King came back, and made a new fortress that looks like a cookie version of Whomp's Fortress. Mario and Lily later defeated the Cookie King again and used the scattered cookies to fill Civault the Cookie Vault.