01 - Preheat the 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, baking powder, baking soda, and salt until evenly distributed.
03 - Rub lemon zest into the sugar with your fingers to release the oils. Add eggs, Greek yogurt, melted butter, lemon juice, and vanilla extract. Whisk until smooth and homogeneous.
04 - Gently fold the wet mixture into the dry ingredients until just combined, taking care not to overmix to preserve muffin tenderness.
05 - Divide the batter evenly among the prepared muffin cups, filling each approximately three-quarters full.
06 - Bake for 18 to 20 minutes until the tops are golden and a toothpick inserted into 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 powdered sugar with fresh lemon juice until smooth and pourable. Drizzle over cooled muffins and allow glaze to set before serving.