Preheat the oven to 350°F (175°C) and grease a 9-inch cake pan.
In a bowl, whisk together flour, baking powder, baking soda, and salt.
Cream the butter and sugar until light and fluffy.
Beat in the eggs one at a time.
Add sour cream, lemon zest, and lemon juice, mixing well.
Gradually incorporate the dry ingredients into the wet mixture.
Gently fold in the blueberries, avoiding overmixing.
Pour the batter into the prepared cake pan and smooth the top.
Bake for 45 minutes, or until a toothpick comes out clean.
Cool the cake completely before drizzling with optional lemon glaze.