Preheat oven to 375°F and grease 12 muffin tins or line with cupcake liners.
In a large bowl, combine pumpkin puree, eggs, oil, sugar and water. Set aside.
In a medium-sized bowl, combine flour, baking soda, baking powder, salt, and cinnamon and mix .
Slowly pour the dry ingredients into the wet ingredients stirring until combined. Don't over mix.
Scoop out evenly into the prepared muffin pan and top with chocolate chips or chopped nuts if you wish!
Bake at 375°F for 18-22 min until the center comes clean when poked with a toothpick or fork.
Cool on a wire rack, and store in an air-tight container or freeze.
Enjoy!