Beautiful frosted cupcakes are Magnolia Bakery's bread and butter (it's this sweet treat that was popularized by Sex and the City, after all). So when the bakery extended an invitation to a cupcake ...

Combine the banana and butter and mix well. Add the vanilla, lemon juice and salt. Lastly, add the powdered sugar and mix well. The frosting can be used for cake or cupcakes — and can be applied with ...