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1. Preheat oven to 350 degrees and line pans with 24 cupcake liners.
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2. Sift cake mix into a small bowl with cinnamon.
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3. In a large bowl, combine buttermilk, oil, eggs, vanilla extract and sour cream. Don't over mix.
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4. Combine the dry and wet ingredients and stir until well mixed.
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5. Fill liners 3/4 full and bake for 17-22 minutes, or until an inserted knife comes out clean.
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6. Ganache: Melt peanut butter and chocolate chips and stir until smooth. (You can do it over the stove top or use a microwave.)
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7. Once cupcakes have cooled, dip the tops into the ganache and let set before frosting.
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8. Buttercream: Beat butter, cream cheese and peanut butter for 4 minutes. Scrape the bowl as needed. Add powdered sugar and vanilla extract and beat. If your buttercream is too thin, continue to add more powdered sugar.
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9. Pipe onto cooled cupcakes and top with peanut butter chocolate hearts or any candy you have.