01 - Preheat oven to 350°F (175°C). Grease and flour a 9-inch round cake pan or line it with parchment paper.
02 - In a medium bowl, whisk together the flour, baking powder, baking soda, and salt. Set aside.
03 - In a large bowl, beat the softened butter and granulated sugar until light and fluffy, approximately 2 to 3 minutes.
04 - Incorporate eggs one at a time, mixing thoroughly after each addition. Stir in vanilla extract and lemon zest.
05 - Add half of the flour mixture into the wet ingredients, then pour in lemon juice and milk. Mix in the remaining flour mixture just until combined.
06 - Toss blueberries with 1 tablespoon of flour to prevent sinking, then gently fold them into the batter.
07 - Transfer the batter to the prepared pan, smoothing the surface. Bake for 30 to 35 minutes or until a toothpick inserted into the center is clean.
08 - Allow the cake to cool in the pan for 10 minutes, then remove it onto a cooling rack to cool completely.
09 - Beat cream cheese and softened butter together until smooth. Gradually add powdered sugar, lemon juice, lemon zest, vanilla extract, and salt. Continue beating until light and fluffy.
10 - Once fully cooled, spread the lemon cream cheese frosting evenly over the top and sides. Optionally garnish with additional blueberries and lemon zest.