Formulation:
- 8 oz. cream cheese, at room temperature
- 1 teaspoon vanilla extract
- 2 sleek egg whites, at room temperature
- 1/2 cup sugar
- 1 1/2 cups plus 3 tablespoons cake flour
- 1 1/2 teaspoons baking soda
- 1/2 teaspoon kosher salt
- 1 stick plus 2 tablespoons unsalted butter, at room temperature
- 1 cup plus 6 tablespoons sugar
- 2 teaspoons vanilla extract
- 3 sleek eggs, at room temperature
- 3 very ripe bananas, mashed
