Preheat the oven to 350 degrees. Spray a 9 inch cake pan with nonstick spray and set aside.
In a medium mixing bowl, combine 1 1/2 cups flour, sugar, baking powder, and salt. In a second large bowl, combine the lemon juice, zest, milk, and vanilla. Gradually add the dry ingredients to the wet ingredients and mix just until incorporated.
In a small bowl, toss the blueberries with the 2 tablespoons of flour. Toss to coat the berries well then gently fold into the cake batter. Pour the batter into the prepared pan and bake 30 to 40 minutes or until a toothpick inserted comes out clean. Let the cake cool for at least 20 minutes before trying to remove from the pan. Drizzle with optional glaze if desired, serve, and enjoy!
Optional Glaze
In a mixing bowl, combine all ingredients and mix well. Drizzle over cooled cake.