2 1/2 cups all-purpose flour
1/2 teaspoon baking powder
1/2 teaspoon baking soda
1/2 teaspoon salt
2 sticks unsalted butter, at room temperature
1 cup granulated sugar
1/4 cup packed light brown sugar
1 large egg
1 teaspoon pure vanilla extract
1 tablespoon finely grated lemon zest, plus 2 tablespoons fresh lemon juice
1/4 cup molasses
1 teaspoon ground ginger
1 teaspoon ground cinnamon
1/4 teaspoon ground allspice
Sanding sugar, for sprinkling