Preheat oven to 400 degrees.
Combine sugar and lemon zest. Then whisk in flour, baking powder, baking soda, and salt.
In another bowl, whisk together eggs, Greek yogurt, vanilla, butter and lemon juice.
Add wet ingredients to dry ingredients. Stir in poppy seeds.
Spoon batter into paper muffin cups or lightly greased muffin pan about 3/4 way full.
Bake for 16-18 minutes or until toothpick is inserted and comes out clean.
Transfer to wire rack for a couple of minutes to cool then serve.