Preheat your oven to 350°F (175°C) and grease a 9-inch cake pan.
In a bowl, cream together the softened butter and sugar until fluffy.
Add eggs one at a time, beating well after each addition.
Stir in the lemon zest and juice, mixing until combined.
In a separate bowl, whisk together flour, baking powder, baking soda, and salt.
Gradually add the dry ingredients to the wet mixture, alternating with milk.
Gently fold in the blueberries to avoid crushing them.
Pour the batter into the prepared cake pan and smooth the top.
Bake for 30-35 minutes, or until a toothpick comes out clean.
Allow the cake to cool in the pan for 10 minutes before transferring to a wire rack.