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1. Preheat oven to 350 degrees and line pans with cupcake liners.
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2. In a small bowl, sift cake mix and set aside.
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3. In a large bowl, gently whisk eggs, oil, buttermilk, sour cream and vanilla extract.
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4. Add cake mix and cinnamon to wet ingredients and stir.
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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. Ganache: Melt chocolate and peanut butter together and stir until smooth. Dip the tops of the cooled cupcake into the ganache and let set for at least 10 minutes.
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7. Buttercream: Beat butter and peanut butter. Add powdered sugar a little at a time until you reach your desired consistency. Add vanilla extract. (Add 1 Tablespoon milk if you buttercream is too thick.)
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8. Pipe buttercream onto ganache covered cupcake and roll in Reese's Puffs cereal.