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Preheat the oven to 375 degrees Fahrenheit. Grease and flour a 13 x 9 x 2-inch baking pan and set aside.
In a large bowl, add the sugar, sour cream, butter, and eggs. Using an electric hand mixer, beat until creamy.
Blend in the mashed bananas and vanilla extract.
Add the flour, baking soda, and salt, and blend until incorporated. Stir in walnuts, if using.
Spread the batter evenly into the prepared pan. Bake 20 to 25 minutes or until golden brown.
In a large saucepan, add the butter and heat over medium heat. Heat the butter until boiling. Allow the butter to simmer and heat into a delicate brown color. Remove from the heat immediately.
Add the powdered sugar, vanilla extract, and milk. Whisk together until smooth.
Spread the brown butter frosting over the warm bars and enjoy!