• Preheat the oven to 350°F. Spray a 9x13 inch baking pan with cooking spray.
• In a medium bowl, whisk together freshly milled flour, baking powder, baking soda, and salt. Set aside.2 1/2 cups freshly milled flour,1 teaspoon baking powder,1 teaspoon baking soda,1/4 teaspoon salt.
• In a large bowl, cream together the butter and granulated sugar until light and fluffy. Beat in the eggs, one at a time, then stir in the mashed bananas and vanilla extract.1/2 cup salted butter,1 cup granulated white sugar,2 large eggs,1 3/4 cups mashed ripe bananas,1 teaspoon vanilla extract.
• Gradually add the flour mixture to the banana mixture, alternating with sour cream, mixing just until incorporated.1/2 cup sour cream.
• Pour batter into the prepared pan. Bake for 25-30 minutes, or until a toothpick inserted into the center of the cake comes out clean.
• Allow the cake to cool completely before frosting.

For the Frosting:

• In a large bowl, beat cream cheese and butter until fluffy. Add the confectioners’ sugar, vanilla extract, and a pinch of salt; beat until smooth.8 ounces cream cheese,1/2 cup salted butter,3 cups confectioners' sugar,1 teaspoon vanilla extract,Pinch of salt.
• Spread the frosting evenly over the cooled cake.
• You can serve this banana cake as is, or with sliced bananas on top for added decoration and flavor. Store the cake in the refrigerator due to the cream cheese frosting.