Mix cake batter as per box mix in sour cream and vanilla. Pour into cupcake pan and bake. Allow cupcakes to cool.
For the frosting, combine cream cheese and butter in a large bowl. Beat with mixers until smooth. Slowly add in powdered sugar and continue to mix. Add in vanilla and cinnamon and continue to mix until smooth and creamy.
Frost cupcakes and sprinkle cinnamon sugar on top.
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