Prepare the Base Preheat the oven and line your baking sheets with parchment paper. In a medium bowl, whisk together the flour, ginger, cinnamon, nutmeg, cloves, baking soda, and salt until perfectly blended.

Cream the Butter and Sugars Using an electric mixer, beat the softened butter with the brown sugar and granulated sugar in a large bowl until the mixture is creamy and smooth.

Mix the Wet Ingredients Incorporate the molasses, vanilla extract, and the egg into the butter mixture. Continue beating until the batter is uniform and smooth.

Combine and Add Oats Slowly mix the dry spice and flour blend into the wet ingredients on low speed. Once just combined, stir in the oats by hand or with the mixer until evenly distributed.

Bake the Cookies Scoop the dough into rounded tablespoons and place them on the prepared sheets with space to spread. Bake until the tops are set but still soft. Allow them to cool on the pan briefly before transferring to a wire rack.

Whip the Filling Beat the softened butter and cream cheese together until no lumps remain. Gradually add the powdered sugar, vanilla, and salt, whipping until the frosting is light and fluffy.

Assemble the Pies Once the cookies are completely cooled, spread a layer of frosting onto the flat side of one cookie and press another cookie on top to create the sandwich.