Preheat the oven to 350 degrees and spray 9 x 5 inch loaf pan with cooking spray
In a large bowl, combine the flour, baking powder, and salt.
In a medium bowl, mix together the oil, yogurt, sugar, eggs, lemon zest, and lemon juice until well combined.
Add lemon mixture to the flour mixture and stir well. Scrap the sides and bottom to check for flour pockets.
Pour the batter into prepared pan and bake for 45-50 minutes or until the top is golden brown and a cake taster comes out clean when inserted into the middle.
Cool in the pan for ten minutes, then remove the loaf to a cooling rack. If the bread seems to stick, carefully run a thin butter knife around the edges.
Once the bread is cool, make the icing by combining the lemon juice and sugar. Whisk until smooth with no lumps.
Place the loaf on a cooling rack set over a baking sheet or cutting board, then carefully pour the icing over the top. Use a butter knife to evenly spread the icing over the top. Excess icing may spill onto the baking sheet. Let the icing set for about 30 minutes before enjoying.