Free Hat Creek Birthday Cake Shake

It’s your birthday month, and Hat Creek Burger Company is celebrating their 17th with a free birthday cake shake. This vanilla shake is blended with white cake mix and rainbow sprinkles, then topped with whipped cream — a sweet way to cap off your September. But there’s a catch: you need the Hat Creek Rewards app. Download it, create an account, and then head to any location in September to redeem it. Just show your QR code when ordering. And remember — this is only for Texas, and it's valid through September 2025. It takes about two minutes to set up, but it's worth it for that birthday shake.