01 - Preheat oven to 350°F. Generously grease a 12-cup mini bundt pan or standard muffin tin with butter or cooking spray.
02 - Whisk together flour, baking powder, baking soda, and salt in a medium bowl until well blended.
03 - Beat softened butter and granulated sugar in a large bowl with electric mixer on medium-high speed until light and fluffy, approximately 2-3 minutes.
04 - Add eggs one at a time, beating thoroughly after each addition. Mix 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. Take care not to overmix.
06 - Divide batter evenly among prepared cups, filling each about 3/4 full. Bake for 16-18 minutes until a toothpick inserted into center comes out clean.
07 - Let cakes cool in pan for 10 minutes before carefully removing. Transfer to wire rack and cool completely before glazing.
08 - Whisk powdered sugar with 2-3 tablespoons fresh lemon juice until smooth and thick but pourable. Drizzle glaze over completely cooled cakes.