01 - Preheat oven to 350°F. Grease and line a 9x5-inch loaf pan with parchment paper.
02 - In a medium bowl, whisk together flour, baking powder, and salt.
03 - In a large bowl, combine sugar and lemon zest. Rub together with your fingers until fragrant. Whisk in yogurt, oil, eggs, lemon juice, and vanilla until smooth.
04 - Stir dry ingredients into wet ingredients until just combined—do not overmix.
05 - Toss blueberries with 1 tablespoon flour, then gently fold into the batter.
06 - Pour batter into prepared loaf pan and smooth the top.
07 - Bake for 50 to 55 minutes, or until a toothpick inserted in the center comes out clean. If browning too quickly, tent loosely with foil during the last 15 minutes.
08 - Let cake cool in pan for 10 minutes, then transfer to a wire rack to cool completely.
09 - Whisk powdered sugar with lemon juice until smooth. Drizzle over cooled loaf before slicing.