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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 and add eggs, mashed bananas, oil, sour cream and vanilla extract. Stir until well combined.
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3. Fill cupcake liners 3/4 full and bake for 15-20 minutes or until an inserted knife comes out clean.
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4. Let cool.
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5. Chocolate Peanut Butter Frosting: Beat butter and peanut butter for 1 minute. Add milk, vanilla extract and cocoa powder and beat again. Slowly add in powdered sugar 1 cup at a time until your reach your desired consistency. If it becomes too thick, like cookie dough, add in more milk!
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6. Pipe onto cooled cupcakes and top with sprinkles!