What is the birthday reward for each membership tier? Can I change it?

Chick-fil-A One^® Members will receive their choice of Chocolate Chunk Cookie or Chocolate Fudge Brownie. Chick-fil-A One Silver Members will receive a dessert variety reward, which allows members to redeem a reward from their choice of a Chocolate Chunk Cookie, Chocolate Fudge Brownie, Small Milkshake, Small Frosted Lemonade, Small Frosted Coffee, Small Icedream^® Cone or Small Icedream^® Cup. Chick-fil-A One Red Members will receive their choice of either a grilled or regular sandwich or 8- and 12-count nuggets. Chick-fil-A One Signature Members will receive their choice of entrée. Unfortunately, we are not able to accommodate substitutions for this reward. Birthday rewards and reward options are subject to change without notice.