Bake cookies for allies using Ether Cane and other ingredients.
Ada-1 can be found in the Tower Annex, and prefers Hot Crossfire Buns, which use Ether Cane and Balanced Flavors.
Devrim Kay can be found in the EDZ, and prefers Gentleman's Shortbread, which uses Ether Cane and Perfect Taste.
Shaw Han can be found in the Cosmodrome, and prefers Blueberry Crumblers, which use Ether Cane and Bullet Spray.
Suraya Hawthorne can be found in the Tower Bazaar, and prefers Eliksni Birdseed, which uses Ether Cane and Personal Touch.
Ether Cane can be gathered by defeating Fallen combatants.
Additional information about ingredient source and usage can be found by viewing the details screen on Eva's Holiday Oven 2.1.