01 - Preheat oven to 350°F. Grease and flour a 9-inch round cake pan or line with parchment paper.
02 - Whisk together flour, baking powder, baking soda, and salt in a medium bowl. Set aside.
03 - Beat butter and sugar in a large bowl until light and fluffy, approximately 3 minutes.
04 - Incorporate eggs one at a time. Mix in lemon zest, lemon juice, and vanilla extract.
05 - Add half the flour mixture to wet ingredients, mixing gently. Pour in milk, then add remaining flour. Mix just until combined.
06 - Toss blueberries with 1 tablespoon flour, then gently fold into the batter.
07 - Transfer batter to prepared pan, smooth top. Bake for 35-40 minutes until toothpick inserted in center comes out clean.
08 - Let cake rest in pan for 10 minutes. Remove and cool completely on wire rack.
09 - Whisk powdered sugar with lemon juice until smooth. Drizzle over cooled cake before serving.