In a large mixing bowl, whisk together pumpkin purée, vanilla pudding mix, and pumpkin pie spice until smooth.
Fold in the whipped topping gently until everything is combined and fluffy.
Scoop into a serving bowl and chill in the fridge for at least 30 minutes if you have the time.
Top with mini marshmallows, crushed graham crackers, or a sprinkle of cinnamon before serving, if desired.