Unsalted butter, softened, for pan
1 cup all-purpose flour, sifted
1/2 cup plus 3 tablespoons granulated sugar
1/2 teaspoon baking powder
1/8 teaspoon baking soda
Pinch of salt
1/2 cup plain whole-milk yogurt
1/4 cup vegetable oil
1 teaspoon grated orange zest, plus 1 tablespoon orange juice
1 large egg
1/2 teaspoon pure vanilla extract
2 large oranges (1 zested into thin strips, both segmented)
Confectioners' sugar, for dusting