How to Make It
Heat oven to 350° F. Butter an 8-inch baking dish. Whisk together the flour, sugar, baking powder, baking soda, and cinnamon in a medium bowl; set aside. Add the applesauce, buttermilk, butter, and egg and mix to combine. Transfer to the prepared pan and bake until a toothpick inserted in the center comes clean, 20 to 30 minutes. Cool in the pan for 5 minutes, then turn out to cool completely. Dust with the confectioners’ sugar.