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1. Preheat oven to 350 degrees and line pans with cupcakes liners.
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2. Sift cake mix into a large bowl.
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3. Add bananas, eggs, oil, sour cream and vanilla extract and stir until well combined.
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4. Fold in blueberries.
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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. Cream Cheese Frosting: Beat butter and cream cheese until smooth. Add vanilla extract, milk and 2 C. powdered sugar and beat again. Slowly add in more powdered sugar until you reach your desired consistency.
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8. Pipe onto cool cupcakes and top with fresh berries!