Preheat oven to 400 F degrees.
In a large mixing bowl add sugar, eggs, oil, pumpkin puree, vanilla extract and whisk until smooth.
In another mixing bowl combine pumpkin pie spice, all-purpose flour, baking powder, and baking soda, and salt. (I like to combine my dry ingredients using a whisk - totally optional).
Add wet mixture to the dry mixture and stir until combined.
Fold in 1 cup of chocolate chips (reserve the reamining chocolate chips for the top after you pour mixture).
Use muffin liners OR grease muffin pan then divide batter evenly by pouring mixture into the 12 muffin cups. Add remaining chocolate chips to the top of all 12 muffins.
Bake for 15 minutes to 20 minutes, or until lightly browned. Use a toothpick to check the center to make sure it comes out clean.
Allow muffins to cool for 5 minutes then transfer to a wire cooling rack. Cool for at least 15-20 minutes.
Serve and enjoy!