Preheat oven to 350°F (175°C). Grease a 9x5-inch loaf pan and line with parchment paper, leaving overhang on the sides for easy removal.
In a medium bowl, whisk together 1 1/2 cups flour, baking powder, and salt. Set aside.
In a large bowl, beat the softened butter and sugar together with an electric mixer on medium speed until light and fluffy, about 2-3 minutes.
Add eggs one at a time, beating well after each addition. Mix in vanilla extract and lemon zest.
Alternately add the dry ingredients and milk to the butter mixture, beginning and ending with the dry ingredients. Mix just until combined. Stir in lemon juice.
Toss blueberries with 1 tablespoon flour to coat. Gently fold into the batter using a spatula.
Pour batter into prepared loaf pan and smooth the top. Bake for 50-60 minutes, or until a toothpick inserted into the center comes out clean.
Cool in pan for 15 minutes, then lift out using parchment overhang and transfer to a wire rack to cool completely.
Notes
This loaf is best enjoyed within 2-3 days. Store in an airtight container at room temperature or refrigerate for longer freshness.