First, crush up the Graham Crackers (250 gram) in a food processor. Inside a mixing bowl, mix together the crushed cookies, and Butter (100 gram).
Grease the sides of a cake pan with some oil, and line the bottom with non stick baking paper. Transfer the cookie butter mixture to the pan, and using the bottom of a glass, press the mixture evenly to flatten it. Put the pan in the fridge while you work with the rest of the ingredients.
In a separate bowl, beat the Whipping Cream (2 cup) until it is nice and thick.
In another separate bowl, mix together the Cream Cheese (2 package), Brown Sugar (1/2 cup), Caster Sugar (1/2 cup) until they are nice and creamy.
Into the cheese mixture, add in the Pumpkin (500 gram), Vanilla Extract (1 teaspoon), and Pumpkin Pie Spice (1 tablespoon). Mix everything together.
Add in the whipped cream a little bit at a time and blend it well together with the mixture. Then, slowly spoon out the mixture onto the base and even out the surface. Chill in the fridge for about 3 hours.