01 - Preheat oven to 350°F. Grease a 12-cup mini bundt pan or muffin tin thoroughly with butter or cooking spray.
02 - In a medium bowl, whisk together flour, baking powder, baking soda, and salt until well blended. Set aside.
03 - In a large bowl, beat softened butter and granulated sugar with an electric mixer on medium speed until light and fluffy, approximately 2–3 minutes.
04 - Add eggs one at a time, beating well after each addition until fully incorporated. Stir in vanilla extract and lemon zest.
05 - Alternate adding the flour mixture and milk to the butter mixture, beginning and ending with the flour mixture. Add lemon juice and mix until just combined; take care not to overmix.
06 - Divide batter evenly among the 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.
08 - Remove cakes from pan and transfer to a wire rack to cool completely. Whisk powdered sugar with enough lemon juice to achieve a thick but pourable consistency. Drizzle glaze over cooled cakes.