From the detailed Wikipedia page 
A cha chaan teng (lit.: tea food hall) meaning tea restaurant, is commonly found in Greater China, including particularly Hong Kong, Macau, Taiwan and parts of Guangdong. They are known for eclectic and affordable menus, which include many dishes from Hong Kong cuisine and Hong Kong-style Western cuisine. Since the 1980s they can also be found in the Chinatown districts of many Western countries like Australia, Canada, United Kingdom and the United States.