In a (chilled) large bowl, add the heavy whipping cream and sugar. Using the hand mixer, beat the whipped cream and sugar on medium speed until stiff peaks form. This can take 1 - 2 minutes. Don't overbeat.
Add the cream cheese, pumpkin, pie spice, and vanilla extract. Mix until just combined using a spatula or the hand mixer on low speed.
Fold in the white chocolate chips with your electric mixer until just combined. Set aside for just a moment.
Break up the graham crackers to cover the bottom of your springform pan. Start with large pieces and then go around the edges with smaller pieces. My photo should help illustrate.
Spread 1/3 of your pumpkin cream mixture on top of the graham crackers. Place more graham crackers on top.
Add another layer of graham cracker and pumpkin, then do it more more time. You will have three layers of cracker and three layers of pumpkin. Smooth the final layer so it's flat.
Stick in the fridge and chill for at least four hours.
Serve your cake garnished with whipped cream and cinnamon if you like.
Notes
NOTE: If you want to make additional whipped cream for topping, double the heavy whipping cream to four cups and the sugar to one cup. Mix like in the recipe and then remove half of the mixture from the bowl and set aside for serving.Nutritional information does not include whipped cream for topping, as it is optional.