Make graham cracker layer by blitzing graham crackers, cinnamon, sugar, and melted butter in a food processor or blender until you get a sand-like texture
Pack the crust into an 8x8 inch pan and par bake for 10 minutes at 350 degrees Fahrenheit.
Remove from oven and let cool for at least 10 minutes
Pumpkin Layer
Whisk pumpkin puree, heavy cream, eggs, sugar, pumpkin pie spice, and chocolate chips. Pour into cooled Crust.
Bake for 1 hour and 20 minutes at 350 degrees Fahrenheit
Marshmallow Layer
Cut marshmallows in half. Lie onto of pumpkins layer evenly. Broil for 1-2 minutes until golden brown.