One of the most popular dishes at Panda Express (the North American Chinese franchise) is their version of Orange Chicken. What makes it so special, and such a hit, is its chili sauce, which is orange flavored. It has been on the Panda Express menu for decades now, since it was conceived by Chef Andy Kho, back in 1987. It definitely takes its inspiration from the flavor profile of the Hunan Province of China, but we do not know who created the original recipe.