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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 small bowl to remove any lumps and set aside.
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3. In a large bowl, combine eggs, oil, mashed bananas, sour cream and vanilla extract.
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4. Stir in cake mix. (You can add 1 cup mini chocolate chips here if you want!)
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5. Fill cupcake liners 3/4 full and bake for 15-20 minutes or until an inserted knife comes out clean.
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6. Let cool.
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7. Chocolate Frosting: Beat butter for 2 minutes. Add cocoa powder and beat again. Add milk, vanilla and slowly add in powdered sugar until you reach your desired consistency.
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8. Pipe onto cooled cupcakes and top with sprinkles and fresh banana slices. Top with the sliced just before serving so they don't turn brown.