Blot the pumpkin puree: place the pumpkin between two layers of paper towel in a small bowl (like a sandwich). Use the top paper towel to press the moisture out of the pumpkin. Discard when wet and repeat several times until the pumpkin appears "dried". Don't skip this step, as blotting pumpkin will improve the texture of these cookies!!
In a stand mixer, cream together butter, brown sugar, and granulated sugar. Mix in the blotted pumpkin, almond milk, and vanilla.
In a separate bowl, combine the flour, pumpkin pie spice, cinnamon, baking powder, baking soda, salt and nutmeg and mix together. With the mixer on low speed, slowly incorporate the flour mixture into the sugar-butter mixture.
Fold in the chopped pecans and white chocolate (if using). Chill in the refrigerator for 1 hour.
Preheat the oven to 350℉. Line 2 baking sheets with parchment paper or silicone baking mats.
Use a spoon to form the chilled dough into generous 1 tablespoon portions and roll into a dough ball. Space dough balls about 3 inches apart on a cookie sheet and slightly flatten. If desired, press extra pecans and white chocolate into the tops of the dough balls before baking (for more delicious looking cookies!).
Bake the cookies for 10-12 minutes. Bake 10 minutes for gooey cookies and 12 minutes for slightly firmer cookies. Allow the cookies to cool about 10 minutes on the cookie sheet before transferring to a cooling rack to completely cool. If your cookies did not spread, you can press them down slightly with the back of a spoon, if desired. Enjoy!