1. Preheat the oven to 325 degrees. Grease a loaf pan with baking spray and set aside.
2. In a large bowl or the bowl of a stand mixer, cream the butter and sugar together on medium speed until light and fluffy, about 3-4 minutes. Scrape the sides of the bowl and add the eggs one at a time, scraping the sides of the bowl and the beating an additional minute to incorporate. Stir in the vanilla and lemon zest.
3. In a small bowl, combine the flour, baking powder, baking soda, and salt. Add half of the dry ingredients to the butter mixture and stir on low until almost combined. Add half of the milk and the lemon juice and stir to almost combine. Repeat this process with the remaining dry and wet ingredients, and fold with a rubber spatula to incorporate the last bits of ingredients.  Do not overmix. Pour the batter into the prepared pan and bake for about 40-45 minutes or until a toothpick inserted comes out clean. Allow the cake to cool in the pan for about 20 minutes and then invert onto a cooling rack to cool completely.

To prepare the glaze:

1. When you’re ready to prepare the glaze, whisk together all the ingredients until a viscous glaze forms. Add more powdered sugar to thicken it up and more sour cream or lemon juice to thin it out. Drizzle over top of the prepared cake and enjoy!