2 cups unbleached all-purpose flour
2 teaspoons baking powder
1/4 teaspoon fine salt
1/2 cup unsalted butter, at room temperature, plus more for greasing the pan
1 teaspoon finely grated lemon zest
2/3 cup granulated sugar, plus up to 1 tablespoon for topping the muffins, if desired
2 large eggs, at room temperature
4 teaspoons poppy seeds
1/2 cup milk
Poppy seeds can go rancid easily and should be stored in the refrigerator or freezer.