Preheat the oven to 350 degrees. Line a cake pan parchment and spray with cooking spray.
In a medium bowl combine flour, sugar, baking powder and salt with a whisk.
In a large bowl whisk together ricotta, eggs, lemon zest and vanilla. Add in the dry ingredients and fold in until combined. Fold in melted butter and then stir in 3/4 cup blueberries.
Pour the batter into the prepared cake pan and top with remaining blueberries.
Bake for 50-55 minutes or until golden and a toothpick inserted into the center comes out clean. Cool on a cooling rack for 20 minutes before removing from the pan.