Preheat oven to 350°F (175°C) and grease a 9x5-inch loaf pan.
In a medium bowl, whisk together flour, baking powder, and salt.
In a large bowl, beat butter and sugar until light and fluffy.
Add eggs one at a time, mixing well after each addition.
Mix in vanilla extract, lemon zest, and lemon juice.
Alternately add flour mixture and milk to the wet ingredients, beginning and ending with flour.
Toss blueberries with 1 tablespoon of flour, then gently fold them into the batter.
Pour batter into the prepared loaf pan and smooth the top.
Bake for 50-60 minutes or until a toothpick inserted into the center comes out clean.
Let cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.