01 - Preheat the oven to 350°F. Grease and line a 9x5-inch loaf pan with parchment paper.
02 - Whisk together the flour, baking powder, baking soda, and salt in a medium bowl. Set aside.
03 - In a large bowl, beat the softened butter and granulated sugar until light and fluffy.
04 - Add the eggs one at a time, mixing thoroughly after each addition.
05 - Stir in the lemon zest, lemon juice, and vanilla extract until evenly combined.
06 - Alternately add the flour mixture and milk to the wet ingredients, beginning and ending with flour. Mix just until combined to avoid overmixing.
07 - Pour the batter into the prepared loaf pan and smooth the surface.
08 - Bake for 45 to 55 minutes, or until a toothpick inserted in the center comes out clean.
09 - Allow the loaf to cool in the pan for 10 minutes, then transfer to a cooling rack to cool completely.
10 - Whisk powdered sugar with fresh lemon juice until smooth and pourable.
11 - Drizzle the glaze over the cooled loaf and let it set before slicing and serving.