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1. Preheat oven to 350 degrees and line pans with cupcake liners.
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2. Sift cake mix into a large bowl to remove any lumps.
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3. Add eggs, oil, mashed bananas, sour cream and vanilla extract. Stir until smooth.
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4. Fill cupcake liners 3/4 full and bake for 15-20 minutes or until an inserted knife comes out clean.
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5. Let cool.
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6. Nutella Frosting: Beat butter and Nutella until smooth, Add cocoa powder, 2 Tbsp. milk and 1 C. powdered sugar and beat again. Continue to slowly add in more powdered sugar until you reach your desired consistency. Add more milk if the frosting becomes too thick.
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7. Pipe onto cooled cupcakes and top with fresh banana slices just before serving!