https://www.mercurynews.com/2021/02/16/krispy-kreme-has-a-special-mars-doughnut-and-its-free-for-some-of-you/ > To mark the landing of Perseverance on Mars, Krispy Kreme is offering a limited-edition doughnut available  only on Thursday. > The Mars doughnut is dipped in caramel, filled with chocolate cream and sprinkled with chocolate cookie crumbs.