Preheat the oven to 350 degrees. Line a baking sheet with a silicone baking mat or parchment paper. In a small bowl, combine flaxseed meal and water. Let sit for 5 minutes to thicken.

In a large bowl, cream together the butter, pumpkin puree, and sugar with a handheld mixer or whisk vigorously until smooth and creamy. Mix in the flax egg and vanilla extract until combined. Add flour, pumpkin spice, baking soda, and salt. Use a wooden spoon or spatula to stir until a soft dough forms. Fold in chocolate chips.

Use a small cookie scoop to distribute dough on to the prepared baking sheet. Bake for 12 minutes. Allow cooling for 5 minutes on baking sheet before transferring to a wire cooling rack.