01 - Preheat oven to 375°F. Line a 12-cup muffin tin with paper liners or grease thoroughly.
02 - In a large bowl, whisk together flour, sugar, poppy seeds, baking powder, baking soda, and salt until evenly mixed.
03 - In a separate bowl, whisk eggs, whole milk, melted butter, fresh lemon juice, lemon zest, and vanilla extract until smooth and homogenous.
04 - Pour wet mixture into dry ingredients and gently fold using a spatula until just combined, leaving some lumps to avoid overmixing.
05 - Spoon batter evenly into 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 tin for 5 minutes before transferring to a wire rack to cool completely.
08 - Whisk sifted powdered sugar with 2 tablespoons lemon juice until smooth; adjust consistency by adding up to 1 more tablespoon lemon juice if needed.
09 - Drizzle glaze over cooled muffins and allow to set for 10 minutes before serving.