01 - Preheat oven to 375°F. Line a 12-cup muffin tin with paper liners or grease thoroughly.
02 - In a medium bowl, whisk together flour, baking powder, baking soda, and salt until evenly mixed.
03 - In a large bowl, beat sugar and eggs until light and fluffy. Add yogurt, vegetable oil, lemon zest, lemon juice, and vanilla extract. Stir until smooth.
04 - Gently fold the dry ingredient mixture into the wet ingredients until just combined, avoiding overmixing.
05 - Lightly coat blueberries with 1 teaspoon of flour, then gently fold them into the batter.
06 - Spoon batter evenly into the prepared muffin cups, filling each about three-quarters full. Optionally, sprinkle coarse sugar on top.
07 - Bake for 18 to 22 minutes or until a toothpick inserted in the center emerges clean.
08 - Allow muffins to cool in the pan for 5 minutes, then transfer to a wire rack to cool completely.