01 - Preheat oven to 350°F. Grease a 12-cup mini bundt or muffin pan thoroughly, or line with paper liners.
02 - Whisk together flour, baking powder, baking soda, and salt in a medium bowl.
03 - Beat butter and sugar in a large bowl until light and fluffy, about 2–3 minutes.
04 - Add eggs one at a time, beating well after each. Stir in lemon zest, lemon juice, and vanilla.
05 - Add flour mixture in three additions, alternating with milk, beginning and ending with flour. Mix until just combined.
06 - Divide batter evenly among prepared cups, filling each about 2/3 full. Bake for 17–20 minutes until toothpick comes out clean.
07 - Let cool in pan for 10 minutes, then transfer to wire rack to cool completely.
08 - Heat milk for glaze just to simmer. Remove from heat, add lavender buds, and steep for 10 minutes. Strain out lavender.
09 - Whisk infused milk with powdered sugar and lemon juice until smooth and pourable.
10 - Drizzle glaze over cooled cakes. Garnish with extra lemon zest or edible lavender if desired.