You can (and should!) make an entire meal out of Popeyes' signature sides, but if you feel compelled to cap your intake at one, opt for the mashed potatoes with cajun gravy. The potatoes, while smooth and creamy, are merely the vehicle for the true star: a rich, tangy, and hearty gravy that's so sumptuous you'll be tempted to ladle it into your mouth like soup. Ask for extra so that you can do just that.