This supermoist cake uses both orange juice and zest for better flavor and texture.
Preheat oven to 350 degrees. Butter an 8-inch round cake pan. Stir flour, 1/2 cup plus 2 tablespoons sugar, the baking powder, baking soda, salt, yogurt, oil, orange zest and juice, egg, and vanilla in a bowl. Pour into pan. Bake until a cake tester comes out clean, about 25 minutes. Let cool on a wire rack.
Place zest strips in a bowl. Stir in segments and remaining tablespoon sugar. Garnish cake with some segments; serve with the rest. Dust with confectioners' sugar.