01 - Preheat oven to 350°F. Grease a 12-cup mini bundt pan or muffin tin thoroughly.
02 - Whisk together flour, baking powder, baking soda, and salt in a medium bowl.
03 - Beat butter and sugar in a large bowl until light and fluffy, approximately 2-3 minutes.
04 - Add eggs one at a time, beating well after each addition. Mix in vanilla extract and lemon zest.
05 - Alternate adding flour mixture and milk to wet ingredients, beginning and ending with flour. Fold in lemon juice until just combined. Avoid overmixing.
06 - Distribute batter evenly among prepared cups, filling each about 3/4 full.
07 - Bake for 16-18 minutes until a toothpick inserted comes out clean. Cool in pan for 10 minutes, then transfer to wire rack.
08 - Whisk powdered sugar with enough lemon juice to achieve a thick, pourable consistency. Drizzle generously over cooled cakes.