Preheat oven to 350 degrees. Line a muffin tin with paper liners or spray with non-stick spray.
In a bowl combine cocoa powder, flour, baking powder, baking soda, salt, and pumpkin pie spice. Set aside.
In a separate large bowl whisk together sugar, pumpkin puree, creamer, oil, eggs, and vanilla. Add flour mixture, stirring until just barely combined. Fold in chocolate chips.
Divide evenly among 16 muffin cups. Bake for 14-18 minutes until a tester comes out clean.
Remove from the oven and cool for 5 minutes before removing from the pan.
Meanwhile make the glaze by mixing powdered sugar and creamer together until it is thin enough to drizzle. Adjust the creamer as necessary.
Once the muffins are cool, drizzle with glaze.