Add 9 sheets of graham crackers to the bowl of a food processor. Add in 1 tablespoon of granulated sugar and ½ teaspoon of ground cinnamon. Pulse until all of the crackers are broken into fine crumbs.
Empty the graham cracker crumbs into a medium sized bowl and pour in the melted butter. Stir well to moisten the crumbs with the melted butter.
Once the butter and crumbs are well combined, press them firmly into the bottom of a 9" glass pie plate.
Cover and place your pie plate in the fridge for 10-15 minutes to firm up while you prepare the pumpkin fluff filling.
Add the pumpkin puree to a large bowl.
Add in the vanilla pudding mix and pumpkin pie spice. Beat with a hand mixer until fully combined.
Add in the thawed whipped topping and fold it in with a silicone spatula until completely combined and uniform.
Spread the pumpkin fluff mixture into the chilled graham cracker crust and cover with plastic wrap. Chill for a minimum of 4 hours before slicing and serving! Sprinkle with additional pumpkin pie spice or a pinch of nutmeg for serving.
Notes
Storage: Keep refrigerated and tightly covered. Will last 3-4 days in the fridge.With graham cracker crumbs: If you purchase your graham cracker crumbs prepared, you can use them for this recipe! You will need to substitute the 9 sleeves of graham crackers for approximately 1 cup of graham cracker crumbs. Stir in the granulated sugar and cinnamon and proceed with the recipe as directed.*Pumpkin pie spice substitute: If you don't have pumpkin pie spice, you can use this recipe to create your own blend. This will make approximately 2 teaspoons, so you will have some leftover (the recipe calls for 1.5 teaspoons). Store your extra pumpkin pie spice in a small airtight container. You can easily double, triple, or quadruple the recipe to make a larger amount to store for future recipes.