01 - Preheat the oven to 350°F. Grease and line a 9x5-inch loaf pan with parchment paper.
02 - In a medium bowl, whisk together the flour, baking powder, baking soda, and salt. Set aside.
03 - In a large bowl, cream the softened butter and sugar together until light and fluffy.
04 - Beat in the eggs one at a time, mixing well after each addition.
05 - Add the lemon zest, lemon juice, and vanilla extract to the mixture and combine thoroughly.
06 - Alternate adding the dry flour mixture and milk to the wet ingredients, starting and ending with the dry mix. Stir gently until just combined, taking care not to overmix.
07 - Pour the batter into the prepared loaf pan and smooth the surface evenly.
08 - Bake for 45 to 55 minutes, or until a toothpick inserted into the center comes out clean.
09 - Let the loaf cool in the pan for 10 minutes before transferring to a wire rack to cool completely.
10 - Whisk powdered sugar with lemon juice until smooth and pourable, then drizzle over the cooled loaf.
11 - Allow the glaze to set before slicing and serving.