Place the pumpkin puree on a few layers of paper towel and top with a few more layers. Press lightly and let sit for about 10 minutes so that the paper towels absorb as much liquid as possible.
While the pumpkin is blotting melt the butter in a large heatproof bowl. Let cool slightly. Add the brown and granulated sugar and whisk till smooth. Add the blotted pumpkin, egg yolk and vanilla and whisk again.
Add the flour, baking soda, kosher salt and pumpkin pie spice and use a rubber spatula to fold till all of the ingredients are combined. Add the ginger nibs and fold again. Cover and chill for at least one hour or overnight.
Pre-heat the oven to 350 degrees Fahrenheit and line 3 baking sheets with parchment paper.
Use a cookie scoop to scoop the chilled dough onto one of the baking sheets (the cookies can all be on one sheet for this step). Roll each scoop into a smooth ball, then roll the ball in the orange-ginger sugar, coating all sides. Divide the scoops between your baking sheets and bake the cookies - one sheet at a time - for 11 - 13 minutes. The edges should be set but the centers slightly soft.
Transfer the cookies to a wire rack to cool completely.
Notes
If you don't have pumpkin pie spice you can use the following spice combo: 1 teaspoon ground cinnamon, 1/2 teaspoon ground ginger and 1/4 teaspoon each ground cloves and ground nutmeg.
If you don't have crystallized ginger nibs you can use an equal amount of chopped candied ginger or omit.
I LOVE this orange-ginger sugar but feel free to roll the cookie scoops in raw or granulated sugar instead.