Heat the griddle to 375°F.
In a medium mixing bowl, mix pancake mix, pumpkin puree, and cinnamon.Add in the milk, egg, and pumpkin puree. Stir to combine but don't over mix. Once the griddle is hot, butter or oil the griddle. Pour the pancake mix onto the griddle using a ¼ cup scoop (or ⅓ for larger pancakes).
Cook the pancakes until you see small bubbles form and start to pop near the edges of the pancakes. Flip the pancakes and continue cooking until browned on each side.
Keep warm in the oven until ready to serve or serve immediately.Top with butter and maple syrup if desired. Store leftovers in an airtight container in the refrigerator for up to 4 days.