Heat grill to 350 degrees on indirect heat. Add a plate setter for a Kamado style grill or turn off the center burners for a gas grill.
Combine all of the ingredients in a dutch oven and stir with whisk. Make sure it is well combined before adding it to the grill.
Heat up on grill until it is hot. Carefully pour into glasses and top with whipped topping and cinnamon.
Pumpkin Choice: We used our Smoked Pumpkin recipe in place of plain pumpkin puree. Pumpkin Pie Spice Recipe: If you don't have pumpkin pie spice in your cabinet, look at the DIY version on AllRecipes for a quick and easy one to whip up. Just cinnamon, nutmeg, ginger and allspice. Sweetness Level: This is not very sweet but you can increase or decrease the sugar for your tastes. Storage: Store in a sealed container for up to 7 days in the refrigerator. Reheat this in the microwave or on the stove top.