01 - Preheat oven to 350°F. Generously grease a 12-cup mini bundt pan or standard muffin tin with butter or cooking spray.
02 - In a medium bowl, whisk together flour, baking powder, baking soda, and salt until thoroughly blended.
03 - Using an electric mixer on medium-high speed, beat softened butter and granulated sugar in a large bowl until pale and fluffy, approximately 2-3 minutes.
04 - Add eggs one at a time, beating well after each addition. Mix in vanilla extract and fresh lemon zest until evenly distributed.
05 - Gradually add flour mixture in three portions, alternating with milk in two portions, beginning and ending with flour. Fold in lemon juice until just combined—take care not to overmix.
06 - Divide batter evenly among prepared cups, filling each about three-quarters full.
07 - Bake for 16-18 minutes, or until a wooden toothpick inserted into the center comes out clean. Allow cakes to cool in the pan for 10 minutes before carefully transferring to a wire rack to cool completely.
08 - Whisk powdered sugar with enough fresh lemon juice to achieve a thick, pourable consistency. Drizzle glaze over completely cooled cakes.