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 combined.
03 - Beat softened butter and granulated 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 the flour mixture and milk to the wet ingredients, beginning and ending with flour. Mix in lemon juice until just combined. Avoid overmixing to ensure tender cakes.
06 - Divide batter evenly among prepared cups, filling each about 3/4 full. Bake for 16-18 minutes until a toothpick inserted comes out clean.
07 - Let cakes cool in the pan for 10 minutes before turning out onto a wire rack to cool completely.
08 - Whisk powdered sugar with enough lemon juice to achieve a thick but pourable consistency. Drizzle generously over completely cooled cakes.