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 until well blended.
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. Stir in vanilla extract and lemon zest until incorporated.
05 - Alternate adding flour mixture and milk to butter mixture, beginning and ending with flour. Add lemon juice and mix until just combined. Avoid overmixing.
06 - Divide batter evenly among prepared cups, filling each about 3/4 full.
07 - Bake for 16–18 minutes or until a toothpick inserted comes out clean. Cool in pan for 10 minutes, then transfer to wire rack to cool completely.
08 - Whisk powdered sugar with enough lemon juice to achieve a thick but pourable consistency. Drizzle over cooled cakes.