Preheat oven to 350 degrees. Line or spray muffin tin with non stick cooking spray.
In a large bowl, combine pumpkin puree, eggs, oil, and maple syrup. Whisk until well combined.
Add flour, oats, salt, baking soda, cinnamon, nutmeg, ginger, and cloves. Mix until just combined.
Fold in chocolate chips or nuts if desired.
Spoon into muffin tins, approximately ⅓ cup in each, about ¾ of the way full.
Bake at for 15-20 minutes, until muffins spring back when touched.