Preheat oven to 350. Coat muffin tins with cooking spray or use paper liners.
In a medium bowl whisk together the flour, baking flour, baking soda, salt, and cinnamon. Set aside.
In a food processor, combine butter, maple syrup, milk, sugar, eggs and banana. Process until smooth. Add flour mixture and pulse until smooth. Fill each muffin cup 3/4 full. Bake until slightly domed, about 30-35 minutes. Cool muffins before frosting.
FROSTING: combine all the ingredients and beat until light and fluffy.
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