Preheat the oven to 350 degrees F. Grease well the bottom and sides of a 9x5" loaf pan.
In a medium bowl, whisk together flour, baking powder, and salt. In a large bowl, beat sugar and oil (or softened butter) until well combined. Add yogurt, eggs, lemon zest and vanilla.
Slowly fold the dry ingredients into the wet, just until incorporated. In a separate bowl mix the blueberries with 1 Tbsp of flour and then gently fold them into the mixed batter. (I always save a few to stick on top of the loaf after I pour it into the pan).
Pour the batter into the pan and bake for 55 minutes - 1 hour or until a toothpick inserted in the center comes out clean.
Remove from oven and allow to cool in the pan for 10 minutes. Transfer to a wire rack to cool completely.
Whisk together the powdered sugar and lemon juice and drizzle over the top of the cooled loaf.
