In a large saucepan over low heat, combine pumpkin pie spice, cinnamon, salt, brown sugar and pumpkin and stir well to combine.
Add milk or water and raise heat just enough to bring the mixture to a low simmer.
Simmer oatmeal over the lowest heat that possible, stirring every few minutes.
Cook for 25 to 30 minutes or until the oas are soft, but not mushy.
Serve with assorted toppings such as walnuts, pecans, dried cranberries, pumpkin seeds, sliced apples, syrup or berries.