01 - Preheat oven to 375°F. Line a 12-cup muffin tin with paper liners or lightly grease.
02 - Whisk together flour, sugar, baking powder, baking soda, and salt in a large bowl.
03 - In a separate bowl, whisk eggs, milk, melted butter, Greek yogurt, lemon zest, lemon juice, and vanilla extract until smooth.
04 - Fold wet ingredients into dry ingredients gently using a spatula until just combined, avoiding overmixing.
05 - Toss blueberries with 1 tablespoon flour, then fold them gently into the batter.
06 - Divide batter evenly among the prepared muffin cups and sprinkle tops with coarse sugar if desired.
07 - Bake for 18 to 22 minutes, or until a toothpick inserted into the center comes out clean.
08 - Let muffins cool in the pan for 5 minutes before transferring to a wire rack to cool completely.