Generously grease a 8½ by 4¼ by 2½-inch loaf pan and line with parchment paper. Set aside.
In a medium-sized mixing bowl, whisk together the flour, poppy seeds, baking powder, and salt.
Pour the sugar into a separate medium-sized mixing bowl and grate all the zest from the orange over top the bowl so it falls on the sugar. Rub the zest into the sugar until the sugar is bright orange and fragrant. Slice the orange in half and squeeze its liquid into a glass measuring cup. Set aside.
In a large bowl whisk together the yogurt, eggs and vanilla. Add 1/2 of the orange juice, and stir to combine. Stir in sugar.
Gently whisk the dry ingredients into the wet ones, stirring just until incorporated. Switch to a rubber spatula and fold in the oil, stirring until you're sure it’s all incorporated.
Pour the batter into the prepared loaf pan and smooth the top.
Bake the cake for 50 to 55 minutes, or until the top is golden and a cake tester comes out of the middle clean.
*While the cake is baking, make your glaze! Simply whisk together the remaining orange juice and the powdered sugar till smooth.
Let the cake cool in the pan for 10 minutes, then remove from the pan using the sides of the parchment paper. Place cake on a large sheet of parchment paper, then pour glaze over the top, letting it run down the sides.
Let the cake cool to room temperature or serve warm (with ice cream?).
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