Preheat the oven to 350°F.
In a mixmaster, combine the cake mix, sour cream, oil, water, sugar, eggs and vanilla.
Blend the ingredients together on low speed for one minute.
Pour the batter into cupcake cups or into a greased bundt pan.
Bake the cupcakes for 15-20 minutes, or until the tops are golden brown and spring back when lightly pressed (if using a bundt pan, bake the cake for 50-55 minutes).
Remove the cupcakes and allow them to cool before frosting or dusting with powdered sugar.
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