01 - Preheat oven to 350°F. Grease and flour two 8-inch round cake pans, lining bottoms with parchment paper.
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, approximately 3 minutes.
04 - Add eggs one at a time, mixing thoroughly after each addition. Stir in lemon zest, lemon juice, and vanilla extract.
05 - Add dry mixture in three parts, alternating with milk, beginning and ending with dry ingredients. Mix just until combined.
06 - Toss blueberries with 1 tablespoon flour to prevent sinking, then gently fold into batter.
07 - Divide batter evenly between prepared pans.
08 - Bake for 30 to 35 minutes, or until a toothpick inserted in center comes out clean.
09 - Allow cakes to cool in pans for 10 minutes, then transfer to wire rack to cool completely.
10 - Beat cream cheese and butter until smooth. Gradually add powdered sugar, lemon zest, lemon juice, vanilla, and salt. Continue beating until light and fluffy.
11 - Place one cake layer on serving plate. Spread with frosting. Top with second layer and frost top and sides evenly.
12 - Decorate with fresh blueberries and additional lemon zest as desired.