Preheat the oven to 350°F.
Mix together the sugar and cinnamon in a small bowl and set aside.
In a mixing bowl, mix together the cake mix, butter, egg and vanilla. (If you like lots of cinnamon flavor, you can add a ½ t more to the batter here also.)
Spoon the dough into 1" balls
Roll the balls in the sugar mixture.
Place the balls on the baking sheet.
Bake for 12 minutes or until they are done.
Allow the cookies to cool on a baking rack.
Store in an airtight container.