Cookies
3 3/4 cups all-purpose flour
1 teaspoon salt
1 teaspoon baking soda
1 1/2 teaspoons ground ginger
1 1/2 teaspoons ground cinnamon
1/4 teaspoon ground cloves
1/4 teaspoon freshly grated nutmeg
3/4 cup (1 1/2 sticks) unsalted butter, at room temperature
3/4 cup packed light brown sugar
1 large egg, at room temperature
3/4 cup molasses
3/4 cup buttermilk

Filling
8 tablespoons (1 stick) unsalted butter, at room temperature
6 oz cream cheese, softened
2 1/2 cups confectioners' sugar, sifted
1/4 plus 1/8 teaspoon vanilla extract
1/2 teaspoon lemon zest
3/4 teaspoon lemon extract