01 - Preheat oven to 375°F. Line a 12-cup muffin tin with paper liners or grease lightly.
02 - In a large bowl, whisk together flour, poppy seeds, lemon zest, sugar, baking powder, baking soda, and salt until evenly mixed.
03 - In a separate bowl, whisk eggs, milk, melted butter, lemon juice, and vanilla extract until fully combined.
04 - Pour wet ingredients into dry ingredients and gently fold until just combined, avoiding overmixing.
05 - Divide batter evenly among muffin cups, filling each about three-quarters full.
06 - Bake for 16 to 18 minutes, or until a toothpick inserted in the center comes out clean.
07 - Allow muffins to cool in the pan for 5 minutes before transferring to a wire rack to cool completely.
08 - Whisk powdered sugar and lemon juice together until smooth and pourable.
09 - Drizzle glaze over cooled muffins before serving.