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 the flour, baking powder, baking soda, and salt until well blended. Set aside.
03 - In a large bowl, beat the softened butter and granulated sugar with an electric mixer on medium-high speed until light and fluffy, about 2-3 minutes.
04 - Add the eggs one at a time, beating well after each addition. Mix in the vanilla extract and lemon zest until incorporated.
05 - Alternate adding the flour mixture and milk to the butter mixture, beginning and ending with the flour. Mix in the lemon juice until just combined. Be careful not to overmix.
06 - Divide the batter evenly among the prepared cups, filling each about 3/4 full. Bake for 16-18 minutes, or until a wooden toothpick inserted into the center comes out clean.
07 - Let the cakes cool in the pan for 10 minutes, then carefully turn them out onto a wire rack to cool completely before glazing.
08 - In a small bowl, whisk together the powdered sugar and enough lemon juice to form a thick but pourable consistency. Drizzle the glaze over the completely cooled cakes.