Chick-fil-A is giving away a delicious free brownie for Chick-fil-A One Members. From January 11 to January 23, members can redeem their free brownie on their Chick-fil-A One account by scanning or placing a mobile order on the app in the drive thru, inside the restaurant or via curbside pick up. Chick-fil-A is a large American fast food chain that specializes in chicken sandwiches.