01 - Preheat the oven to 350°F. Grease a 12-cup mini bundt pan or muffin tin thoroughly with cooking spray or butter.
02 - In a medium bowl, whisk together flour, baking powder, baking soda, and salt until well combined.
03 - In a large bowl, beat butter and sugar with an electric mixer until light and fluffy, about 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 butter mixture, starting and ending with flour. Mix in lemon juice until just combined; do not overmix.
06 - Divide batter evenly among prepared cups, filling each about 3/4 full.
07 - Bake for 16-18 minutes, or until a toothpick inserted into the center comes out clean.
08 - Let cakes cool in the pan for 10 minutes, then carefully turn out onto a wire rack to cool completely.
09 - Whisk powdered sugar with enough lemon juice to form a thick but pourable glaze, adding juice 1 tablespoon at a time.
10 - Drizzle the glaze over the cooled cakes, allowing it to set for 15 minutes before serving.