Pre-heat oven to 350 degrees and line a 12 count cupcake tin.
In large mixing bowl, add cake mix and pumpkin.
Using a hand mixer, beat until completely combined.
Divide batter into cupcake liners.
Bake for 20 - 22 minutes or until toothpick comes out clean.
Cool completely before icing.
Mix 1 teaspoon of cinnamon in each tub of icing.
Frost cupcakes and enjoy!