Preheat the oven to 350 degrees.
Spray a loaf pan with cooking spray.
In a large bowl, combine the flour, baking powder, cinnamon, sugar, salt, and 1 1/2 cups of the blueberries.
In another bowl, lightly whisk together the eggs, oil, vanilla, sour cream, and lemon juice and zest.
Pour the wet ingredients into the dry ingredients, and stir until combined.
Pour the batter into the loaf pan and sprinkle the remaining 1/4 cup of blueberries over the top.
Bake at 350 degrees for 55-60 minutes, or until a toothpick comes out clean.
Cool completely before removing from the pan.