Shake Shack (NYSE: SHAK) shares soared last week after it was released the burger and fries restaurant trademarked the name "Chicken Shack," possibly leading toward a more diverse menu for the slim-pickings fast causal brand. Further, the company hinted even more a expanded menu items, posting a job listing for a "culinary research and development manager." This position would be primarily responsible to "lead and manage the research and development process for the Culinary team of new and existing food and beverage menu items and ingredients," according to Yahoo Finance. Currently, only a handful locations serve breakfast, unlike competitor and fast food giant McDonald's, which serves breakfast as well as a slew of other customizable options, Yahoo Finance reported. For more business and financial news, click here.