Whataburger Spicy Chicken Sandwich on new brioche bun. On Monday, Whataburger announced its Spicy Chicken Sandwich and BBQ Bacon Burger are back on the menu. The recently debuted Spicy Chicken Sandwich includes a crispy chicken filet, topped with fresh, cool leaf lettuce, tomatoes, pickles and mayo on Whataburger’s new brioche bun. The returning BBQ Bacon Burger includes three slices of bacon, smoked cheddar and Monterey Jack paired with two pure beef patties and a smoky tangy BBQ sauce. Both items are returning to Whataburger’s menu for a limited time.