In a large bowl, beat the butter and sugar together until smooth.
Add the molasses, egg and pumpkin and continue beating until combined.
In a separate bowl, whisk together the flour, cinnamon, baking soda, ginger, and salt.
Stir the dry ingredients into the wet ingredients, stirring until combined.
Line two baking sheets with parchment paper or silicone mats.
Drop the cookie dough onto the prepared pans and place in the freezer for 10 minutes, or in the fridge for 30 minutes.
Preheat the oven to 350℉.
Remove the cookies from the freezer and bake immediately for 15-16 minutes or until just baked in the centres.
Allow to cool for 2 minutes on the pans before transferring to a cooling rack to finish cooling.