Start by preheating your oven to 350°F (175°C) and greasing your loaf pan with butter or cooking spray. Then, in a large bowl, mix the all-purpose flour, baking powder, and salt. Set it aside—this will be the foundation of your batter.
Next, grab another bowl and whisk together the Greek yogurt, sugar, eggs, lemon zest, vanilla extract, and vegetable oil. The mixture should be smooth and slightly frothy. This combination ensures the loaf is packed with flavor and stays moist.
Now, pour the wet ingredients into the bowl with the dry ingredients. Gently fold them together until just combined. Be careful not to overmix; this can make the loaf dense.
Toss the blueberries in a tablespoon of flour to coat them lightly. This keeps them from sinking to the bottom of the batter. Fold them carefully into the batter, making sure they’re evenly distributed.
Pour the batter into your prepared loaf pan and bake for 50 minutes or until a toothpick inserted in the center comes out clean. The top should be golden and slightly cracked. Allow the loaf to cool in the pan for 10 minutes, then transfer it to a cooling rack.
While the loaf cools, heat lemon juice and sugar in a small saucepan until the sugar dissolves. Poke small holes in the top of the loaf with a toothpick and pour the syrup evenly over it. This infuses extra lemony flavor.
Finally, whisk together icing sugar, lemon juice, and a touch of milk (if needed) to make a smooth glaze. Drizzle it liberally over the cooled loaf, slice, and enjoy!