Preheat oven to 350°F (175°C).
Line two 8-inch cake pans with parchment paper and lightly grease them.
In a medium bowl, whisk together flour, baking powder, and salt.
In a large mixing bowl, beat butter, oil, and sugar until creamy and light.
Add eggs one at a time, mixing after each addition.
Alternately add the dry ingredients and milk, beginning and ending with dry ingredients.
Add lemon juice, vanilla extract, and lemon zest.
Mix until just combined. Do not overmix.
Divide the batter evenly between the prepared pans.
Bake for 28–32 minutes or until a toothpick inserted into the center comes out clean.
Let the Lemon Blueberry Cake layers cool completely before frosting.