Preheat your oven to 350ºF.
Prepare a 9x4 inch loaf pan. Spray your bread pan with non-stick cooking spray or line it with parchment paper.
In a large bowl, combine all-purpose flour, baking powder and salt.
In a medium bowl, combine the vegetable oil, sugar, sour cream, freshly squeezed lemon juice, lemon zest, eggs and vanilla extract.
Whisk wet ingredients until fully mixed.
With a spatula, fold the wet ingredients into the dry ingredients. Do not overmix. A little bit of the dry mix should still be visible when it is mixed.
Pour batter into the prepared pan.
Bake for 45-55 minutes or until a toothpick is inserted and comes out with only a few crumbs on it.
Remove from the oven and let cool in the pan for about 10 minutes. Then remove the bread from the pan and let cool completely on a cooling rack.
Mix powdered sugar and 2 tablespoons of lemon juice to make the glaze.
Once bread is completely cool, drizzle the top with your glaze.
Serve.