Preheat oven to 350 degrees F and grease a 9x9 inch baking pan with cooking spray, or butter. Set Aside.
Combine all the pumpkin filling ingredients in a large prep bowl and stir to combine. The mixture will be smooth.
Crush/grind the graham crackers in a blender or a large zip-lock bag. It's okay if their are some chunks it will add to the texture of the topping.
In a separate prep bowl add all the topping ingredients, except the butter, and stir until combined.
Chop the butter into small cubes and add to the topping mix and use your hands or a fork to incorporate. It's okay if there are some butter chunks.
Pour the filling mix into the prepared baking pan then sprinkle over the topping in an even layer. Bake on the center rack of the oven for 30-40 minutes until the top is golden brown and crispy. Enjoy warm or cold with additional toppers of choice.