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1. Preheat oven to 350 degrees and line pans with cupcake liners or use white souffle cups like I did.
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2. Sift cake mix, cocoa powder, cinnamon and baking powder into a bowl. Stir and set aside.
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3. In a large bowl, gently whisk oil, eggs, buttermilk, sour cream and vanilla extract together.
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4. Add the dry ingredients to the wet and stir until smooth.
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5. Fill cupcake liners 3/4 full and bake for 15-20 minutes, or until and inserted knife comes out clean.
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6. Cookie Dough Frosting: Beat butter, cream cheese and brown sugar for 2 minutes. In a separate bowl, combine flour and salt. Add flour/salt mixture to butter mixture and beat. Add vanilla extract and slowly add powdered sugar until you reach your desired consistency. Add 1 tablespoon of milk if your cookie dough mixture is too thick. Continue to add more if needed.
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7. Pipe frosting onto cooled cupcakes and top with chocolate curls. (I use a bar of chocolate and a cheese grater to make my curls :) )