1 package (3.4 oz) instant vanilla pudding mix
1 tub (8 oz) Cool Whip
1 tsp pumpkin pie spice (I omitted this when I made it just because I didn't have any)
Essentially you just need to mix all the ingredients together, but I found it works best if you mix everything but the Cool Whip together really well and then mix in the Cool Whip at the end. Refridgerate for at least two hours and serve.
The recipe says to serve it with Nilla wafers, but I like it with cinnamon graham crackers.