Preheat the oven to 375°F (190°C) and line a muffin pan with paper liners.
In a large bowl, whisk together flour, sugar, baking powder, baking soda, and salt.
In another bowl, whisk eggs, melted butter, milk, lemon zest, lemon juice, and vanilla.
Pour the wet mixture into the dry ingredients. Stir gently until just combined.
Toss the blueberries with 1 teaspoon flour. Fold them into the batter.
Fill each muffin cup about ¾ full.
Bake for 18–22 minutes, or until a toothpick inserted in the center comes out clean.
Let the muffins cool in the pan for 5 minutes, then transfer to a wire rack.