01 - Preheat oven to 350°F. Grease a 9x5-inch loaf pan and line with parchment paper.
02 - Whisk together flour, baking powder, and salt in a medium bowl until well combined.
03 - Combine sugar and lemon zest in a large bowl, rubbing together with fingers until fragrant. Whisk in yogurt, oil, eggs, lemon juice, and vanilla until smooth.
04 - Stir dry ingredients into wet mixture until just combined. Avoid overmixing to prevent dense texture.
05 - Toss blueberries with 1 tablespoon flour, then gently fold into the batter.
06 - Transfer batter to prepared loaf pan and smooth the top evenly.
07 - Bake for 50-55 minutes until a toothpick inserted in the center comes out clean. Tent with foil during last 15 minutes if browning too quickly.
08 - Let cake cool in pan for 10 minutes, then transfer to wire rack to cool completely.
09 - Whisk powdered sugar with lemon juice until smooth. Drizzle over cooled loaf before slicing.