Preheat oven to 350 degrees
Spray 9x13 baking dish with cooking spray In a large bowl add the pumpkin, milk, brown sugar, eggs, pumpkin pie spice and cinnamon and mix well
Pour the pumpkin mixture in baking dish
Sprinkle the vanilla cake mix over the top
Sprinkle on the graham cracker crumbs
Sprinkle on the chocolate chips
Drizzle the butter over the top
Bake for 45 - 50 minutes or until edges are golden brown
Allow to cook for 5 - 10 mintues before serving. If you can wait that long!
Enjoy!