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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.
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3. Add mashed bananas, eggs, oil, sour cream and vanilla extract and stir until well combined.
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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 together. Add cocoa powder, vanilla extract and milk and beat again. Slowly add in powdered sugar until you reach your desired consistency. If it becomes too thick, add more milk!
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7. Pipe onto cooled cupcakes and top with hazelnuts!