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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 and add mashed bananas, eggs, oil, sour cream and vanilla extra. Stir until smooth.
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3. Full cupcake liners 3/4 full and bake for 15-20 minutes or until and inserted knife comes out clean.
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4. Let cool.
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5. Brownie Batter Frosting: Beat butter for 2 minutes until smooth. Add brownie mix and beat again for 2 minutes. Add vanilla extract, 1 Tbsp. milk and 1 cup powdered sugar. Continue to add more sugar until you reach your desired consistency. Add more milk if it becomes too thick and add 1-2 Tbsp. unsweetened cocoa powder if you want a richer chocolate flavor.
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6. Pipe frosting onto cooled cupcakes and top with sprinkles for color!