Preheat oven to 350 degrees then line a half sheet pan with a silpat or parchment paper and set aside.
Add butter and 1 cup sugar to the bowl of an electric mixer or large glass bowl if using a handheld mixer. Beat until lightly and fluffy. Add pumpkin puree, molasses, and vanilla then beat until combined. Add egg then mix until just combined.
In a separate bowl stir together flour, baking soda, cinnamon, 1-1/2 teaspoons ground ginger, ground cloves, and salt. Add to the wet ingredients in two batches, mixing until just combined before adding the second batch. Add dark chocolate morsels then mix until just combined.
Stir together remaining 3/4 cup sugar and 3 teaspoons ground ginger in a bowl then scoop cookie dough by the Tablespoon into the mixture and roll to coat. Place onto prepared baking sheet then bake for 7-8 minutes (7-1/2 minutes were perfect for mine.) Rap the sheet pan on the counter (aka drop the sheet pan from a couple inches above the countertop onto the countertop) then let cookies cool slightly before transferring to cooling racks to cool completely.
Pumpkin Purée Moisture Regulation
Pure pumpkin purée introduces significant moisture compared to solid pack fillings, requiring careful balance with gluten-free flour blends to prevent gumminess. Fresh pumpkin contains variable water levels that demand thorough draining if substituted, whereas canned commercial purée provides standardized starch and water ratios. Incorporating the dry ingredients in two distinct additions ensures even hydration across the dense batter without overworking the starch components.
Thermal Dynamics of Molasses and Spices
Molasses contains invert sugars that actively attract ambient moisture, creating a soft crumb structure that persists for days at room temperature. Ground ginger and cloves deliver volatile aromatic compounds that dissolve efficiently in the butter fat phase before baking. Creaming the butter and sugar at a moderate speed incorporates microscopic air cells that expand when exposed to the 350 degrees Fahrenheit oven environment.
Pan Rapping for Density Control
Dropping the baking sheet from a height of two inches onto the counter immediately after the 7 to 8 minute bake time forces escaping steam to deflate the center. This mechanical shock collapses the internal crumb slightly, yielding a dense, fudgy center enclosed by a crinkly exterior. Transferring the batch to wire racks stops residual bottom cooking once the edges set.