In a medium bowl, sift the flour, baking powder, baking soda, salt, and poppy seeds. Set aside.
2 1/4 cups All-purpose flour, 2 tsp Baking powder, 1/2 tsp Baking soda, 1/2 tsp Salt, 1 1/2 TBSP Poppy seeds
In a separate large bowl, whisk together melted butter, sugar, eggs, vanilla, lemon zest, lemon juice, sour cream, and milk. It will be a little lumpy because of the sour cream.
1/2 cup Unsalted butter, 1 cup White granulated sugar, 2 Large eggs, 1 tsp Pure vanilla extract, 2 TBSP Lemon zest, 1 TBSP Lemon juice, 1/4 cup Sour cream, 1/2 cup Milk
Add in the dry ingredients, mix together using a baking rubber spatula. Mix until just combined.
Preheat the oven to 425℉. Line a 12 cup muffin pan with 6 muffin liners. Leave a space between each liner. This helps give the muffins a taller rise. Let the muffin batter sit for 15 minutes before scooping.