Melt the Butter (1 cup) in a saucepan or in the microwave. Then let it cool.
In a large mixing bowl, combine the All-Purpose Flour (2 3/4 cup), Corn Starch (1 1/2 teaspoon), Salt (1/2 teaspoon), Baking Soda (1 teaspoon), and Pumpkin Pie Spice (1 tablespoon) and then set aside.
Line a small fine-mesh sieve with a paper towel. and add the Canned Pumpkin Purée (3/4 cup) and let it drain while you are mixing together the rest of the ingredients.
In a medium bowl combine the Brown Sugar (2/3 cup), Granulated Sugar (2/3 cup), and the cooled butter. Whisk together.
Add in the drained pumpkin and the Vanilla Extract (1/2 tablespoon).
Add in the dry ingredients and mix until combined.
Add the Dark Chocolate Chips (11.5 ounce) and stir in until they are combined.
Use a cookie scoop to form balls of cookie dough. Chill for 1 hour.
Preheat the oven to 325 degrees F (160 degrees C).
Bake for 10-14 minutes, then let cool slightly before serving.