Sift together 1 1/2 cups flour, baking powder, and salt into 1 bowl. In another bowl, whisk together the yogurt, 1 cup sugar, the eggs, lemon zest, vanilla, and oil. Slowly whisk the dry ingredients into the wet ingredients. Toss the blueberries with the remaining tablespoon of flour, and fold them gently into the batter. Pour the batter into the prepared pan and bake for about 50 (+) minutes, or until a cake tester placed in the center of the loaf comes out clean. Mine took about an extra 10 minutes.