Grease your muffin tin or line it with paper liners.
In a large bowl, combine the cake mix, pumpkin puree, cinnamon, and pumpkin pie spice. Mix until well combined.
Gently fold in 1 cup of chocolate chips.
Divide the batter evenly among the muffin cups. Top each muffin with the remaining chocolate chips. Bake for 15-18 minutes, or until a toothpick inserted into the center comes out clean.
Let the muffins cool in the pan for a few minutes before transferring them to a wire rack to cool completely.