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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