Consider this a "supercake," in the sense that is has an amazing number of superfoods that go into the batter, including plain yogurt, mashed bananas, toasted and ground walnuts, quinoa flour, ground ginger, and ground cinnamon, all of which are off the charts nutritionally speaking. Plus they all add up to one incomparably delicious dessert. The mashed bananas replace much of the usual oil in cake recipes, too, and the ground walnuts and quinoa flour replace much of the usual white flour. More walnuts and brown sugar (a healthier alternative to white) are sprinkled on the top of the cake before baking.