Preheat your oven to 350°F (175°C) and line a muffin tin with liners or grease it with cooking spray.
In a large bowl, combine the canned pumpkin, sugar, and vegetable oil. Whisk until smooth. Add in the eggs one at a time, mixing well after each addition.
In another bowl, blend the flour, baking soda, baking powder, and cinnamon.
Gently fold the dry ingredients into the wet ingredients until just combined. Be careful not to over-mix; a few lumps are okay. Lastly, fold in the chocolate chips.
Use a spoon or muffin scoop to fill each muffin cup about two-thirds full.
Bake for 18-20 minutes, or until a toothpick inserted into the center comes out clean.
Remove muffins from the oven and let them cool in the pan for 5 minutes, then transfer to a wire rack to cool completely.