Queensland-born cult burger joint Betty's Burgers has launched its second Sydney outpost in Castle Hill.

Since opening the Shake Shack-style burger shop back in 2014, founder David Hales has turned his humble Noosa business into an Australian-wide favourite — having opened up shop in Melbourne, Brisbane and its first Sydney store in the ICC in 2017.

Compared with the Darling Harbour shack, which is a small 46 seater (20 indoor and 26 outdoor), the Castle Towers joint has a considerably larger capacity, seating 85. You can expect the same menu of the Angus beef classic, southern fried chicken, pork belly and crispy fried mushroom burgers, along with Betty's signature 'concretes'. For the uninitiated, these are frozen custard shakes with your choice of mix-ins, including peanut butter brittle, hot fudge doughnut and lemon raspberry cheesecake.

The opening of Betty's Burgers is part of the Castle Towers' new food and entertainment precinct. It's home 14 recently opened bars and eateries, including a collaboration between Holey Moley and Strike Bowling, a 350-seat outpost of The Bavarian, Malaysian hawker-style eatery PappaRich, Korean fried chicken and beer joint Gami and Sydney's second over-the-top Nutella-filled Tella Balls Dessert Bar.