01 - Preheat oven to 375°F. Line a 12-cup muffin tin with paper liners or lightly grease it.
02 - In a large bowl, whisk together flour, poppy seeds, baking powder, baking soda, and salt until evenly mixed.
03 - In a separate bowl, whisk sugar, eggs, whole milk, melted butter, lemon juice, lemon zest, and vanilla extract until fully blended.
04 - Pour wet mixture into dry ingredients and gently fold just until combined, taking care not to overmix to maintain tender texture.
05 - Divide batter evenly among muffin cups, filling each approximately three-quarters full.
06 - Bake in preheated oven for 18 to 20 minutes, or until a toothpick inserted into the center emerges clean.
07 - Allow muffins to cool in the tin for 5 minutes before transferring to a wire rack to cool completely.