Preheat oven to 350 degrees F. Lightly coat an 8x4-inch loaf pan with non-stick cooking spray.
In a large mixing bowl, stir the lemon zest into the sugar (this helps release the oils in the zest). Add the milk, oil, eggs, and the 2 tablespoons lemon juice. Whisk until evenly combined.
In a separate small bowl, combine the flour, baking powder, and salt.
Add the flour mixture to the lemon mixture and stir just until flour is incorporated. Fold in the blueberries.
Pour batter into prepared pan.
Bake in preheated oven for 50 to 60 minutes, or until a toothpick inserted into center of the loaf comes out clean.
Cool bread in pan for 10 minutes.
Meanwhile, make the glaze. Whisk 1 tablespoon lemon juice and 1/4 cup confectioners' sugar in a small bowl.
Remove bread from pan (running a knife around edge to loosen bread from pan) and transfer to a cutting board. Evenly drizzle with the glaze.
Cool completely before slicing and serving.