Preheat your oven to 400 degrees. Then, mix all of your ingredients in a large bowl. Do not add the additional ingredients the boxed cake mix calls for. Just the powered mix, pumpkin, and spices. The batter will be thick, but just mix until it's all combined.
Next, add the mix to your muffin tin filling each cavity 1/2 full. I used a mini muffin tin with paper liners but a regular tin will work just fine. If you are not using liners, be sure to spray your pan with non-stick spray.
Now, bake your muffin for 6-8 minutes for mini muffins or 8-10 minutes for regular size muffins. Cool on a wire rack when done.
If you want to dust the muffins with powdered sugar, be sure to wait until they are completely cool or the sugar will melt. Enjoy!