Through January 23rd, Chick-Fil-A is offering a FREE Chocolate Fudge Brownie to all Chick-fil-A One Rewards App Members. If you don't already have an account, download the free Chick-fil-A One App on iTunes or Google Play then register and create your profile and make sure your location services are enabled. Tap on the Rewards tab and choose to Add to a mobile order or to Scan at the restaurant to redeem.