Preheat oven to 350 degrees. Spray a loaf pan with non-stick cooking spray. Place a piece of parchment paper in the pan and let it hang over the two sides of the loaf pan. Set aside.
Add in the vegetable oil and sugar. Mix with a hand mixer on medium until combined.
Add in the eggs, vanilla, lemon juice, and lemon zest. Mix until the eggs are incorporated.
Add in the sour cream and continue to mix. Scrape down the sides of the bowl.
Add in the baking soda, baking powder and flour. Mix until incorporated.
Add in the poppy seeds and stir until evenly distributed.
Scrape the batter into the prepared loaf pan.
Place into the oven and let bake for 45 - 50 minutes or until a toothpick comes out with moist crumbs or clean.
Remove from the oven and let cool.
Once cooled, remove from the pan and peel away the parchment paper. Set on a serving plate.
Glaze
In a small dish, add in the powdered sugar and lemon juice. Whisk until the glaze is smooth.
Using a spoon. drizzle it back and forth on the top of the bread. Some will run down the sides.
Notes
If you want to make this ahead, wrap and freeze a completely cooled loaf. Then thaw and glaze before serving.