In a large mixing bowl, combine all-purpose flour, ground ginger, cinnamon, nutmeg, cloves, baking soda, and salt to create your dry mixture.
In another bowl, beat together unsalted butter and brown sugar until light and fluffy before adding in your egg and vanilla extract.
Gradually incorporate your dry mixture into the wet mixture until fully combined before folding in molasses for added richness.
Scoop dough onto prepared baking sheets, spacing them evenly apart, as they will spread during baking.
Bake at an appropriate temperature until edges are set but centers are still soft; they will continue cooking out of the oven.
While cookies cool, whip together softened butter, vegan marshmallow cream, salt, powdered sugar, and milk or cream until creamy before assembling your Ginger Cream Pies!